1522 lines
51 KiB
C
1522 lines
51 KiB
C
/*
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* AVI demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/avstring.h"
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#include "libavutil/bswap.h"
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#include "libavutil/dict.h"
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/mathematics.h"
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#include "avformat.h"
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#include "avi.h"
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#include "dv.h"
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#include "internal.h"
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#include "riff.h"
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#undef NDEBUG
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#include <assert.h>
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typedef struct AVIStream {
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int64_t frame_offset; /* current frame (video) or byte (audio) counter
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* (used to compute the pts) */
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int remaining;
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int packet_size;
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uint32_t scale;
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uint32_t rate;
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int sample_size; /* size of one sample (or packet)
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* (in the rate/scale sense) in bytes */
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int64_t cum_len; /* temporary storage (used during seek) */
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int prefix; /* normally 'd'<<8 + 'c' or 'w'<<8 + 'b' */
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int prefix_count;
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uint32_t pal[256];
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int has_pal;
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int dshow_block_align; /* block align variable used to emulate bugs in
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* the MS dshow demuxer */
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AVFormatContext *sub_ctx;
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AVPacket sub_pkt;
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uint8_t *sub_buffer;
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} AVIStream;
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typedef struct {
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int64_t riff_end;
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int64_t movi_end;
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int64_t fsize;
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int64_t movi_list;
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int64_t last_pkt_pos;
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int index_loaded;
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int is_odml;
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int non_interleaved;
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int stream_index;
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DVDemuxContext *dv_demux;
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int odml_depth;
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#define MAX_ODML_DEPTH 1000
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} AVIContext;
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static const char avi_headers[][8] = {
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19 },
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{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
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{ 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
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{ 0 }
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};
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static const AVMetadataConv avi_metadata_conv[] = {
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{ "strn", "title" },
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{ 0 },
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};
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static int avi_load_index(AVFormatContext *s);
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static int guess_ni_flag(AVFormatContext *s);
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#define print_tag(str, tag, size) \
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av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \
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str, tag & 0xff, \
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(tag >> 8) & 0xff, \
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(tag >> 16) & 0xff, \
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(tag >> 24) & 0xff, \
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size)
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static inline int get_duration(AVIStream *ast, int len)
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{
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if (ast->sample_size)
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return len;
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else if (ast->dshow_block_align)
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return (len + ast->dshow_block_align - 1) / ast->dshow_block_align;
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else
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return 1;
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}
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static int get_riff(AVFormatContext *s, AVIOContext *pb)
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{
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AVIContext *avi = s->priv_data;
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char header[8];
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int i;
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/* check RIFF header */
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avio_read(pb, header, 4);
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avi->riff_end = avio_rl32(pb); /* RIFF chunk size */
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avi->riff_end += avio_tell(pb); /* RIFF chunk end */
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avio_read(pb, header + 4, 4);
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for (i = 0; avi_headers[i][0]; i++)
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if (!memcmp(header, avi_headers[i], 8))
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break;
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if (!avi_headers[i][0])
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return AVERROR_INVALIDDATA;
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if (header[7] == 0x19)
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av_log(s, AV_LOG_INFO,
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"This file has been generated by a totally broken muxer.\n");
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return 0;
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}
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num)
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{
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AVIContext *avi = s->priv_data;
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AVIOContext *pb = s->pb;
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int longs_pre_entry = avio_rl16(pb);
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int index_sub_type = avio_r8(pb);
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int index_type = avio_r8(pb);
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int entries_in_use = avio_rl32(pb);
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int chunk_id = avio_rl32(pb);
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int64_t base = avio_rl64(pb);
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int stream_id = ((chunk_id & 0xFF) - '0') * 10 +
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((chunk_id >> 8 & 0xFF) - '0');
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AVStream *st;
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AVIStream *ast;
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int i;
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int64_t last_pos = -1;
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int64_t filesize = avio_size(s->pb);
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av_dlog(s,
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"longs_pre_entry:%d index_type:%d entries_in_use:%d "
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"chunk_id:%X base:%16"PRIX64"\n",
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longs_pre_entry,
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index_type,
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entries_in_use,
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chunk_id,
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base);
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if (stream_id >= s->nb_streams || stream_id < 0)
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return AVERROR_INVALIDDATA;
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st = s->streams[stream_id];
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ast = st->priv_data;
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if (index_sub_type)
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return AVERROR_INVALIDDATA;
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avio_rl32(pb);
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if (index_type && longs_pre_entry != 2)
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return AVERROR_INVALIDDATA;
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if (index_type > 1)
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return AVERROR_INVALIDDATA;
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if (filesize > 0 && base >= filesize) {
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
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if (base >> 32 == (base & 0xFFFFFFFF) &&
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(base & 0xFFFFFFFF) < filesize &&
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filesize <= 0xFFFFFFFF)
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base &= 0xFFFFFFFF;
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else
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return AVERROR_INVALIDDATA;
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}
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for (i = 0; i < entries_in_use; i++) {
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if (index_type) {
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int64_t pos = avio_rl32(pb) + base - 8;
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int len = avio_rl32(pb);
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int key = len >= 0;
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len &= 0x7FFFFFFF;
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av_dlog(s, "pos:%"PRId64", len:%X\n", pos, len);
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if (pb->eof_reached)
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return AVERROR_INVALIDDATA;
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if (last_pos == pos || pos == base - 8)
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avi->non_interleaved = 1;
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if (last_pos != pos && (len || !ast->sample_size))
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av_add_index_entry(st, pos, ast->cum_len, len, 0,
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key ? AVINDEX_KEYFRAME : 0);
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ast->cum_len += get_duration(ast, len);
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last_pos = pos;
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} else {
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int64_t offset, pos;
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int duration;
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offset = avio_rl64(pb);
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avio_rl32(pb); /* size */
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duration = avio_rl32(pb);
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if (pb->eof_reached)
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return AVERROR_INVALIDDATA;
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pos = avio_tell(pb);
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if (avi->odml_depth > MAX_ODML_DEPTH) {
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av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
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return AVERROR_INVALIDDATA;
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}
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avio_seek(pb, offset + 8, SEEK_SET);
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avi->odml_depth++;
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read_braindead_odml_indx(s, frame_num);
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avi->odml_depth--;
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frame_num += duration;
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avio_seek(pb, pos, SEEK_SET);
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}
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}
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avi->index_loaded = 1;
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return 0;
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}
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static void clean_index(AVFormatContext *s)
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{
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int i;
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int64_t j;
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for (i = 0; i < s->nb_streams; i++) {
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AVStream *st = s->streams[i];
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AVIStream *ast = st->priv_data;
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int n = st->nb_index_entries;
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int max = ast->sample_size;
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int64_t pos, size, ts;
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if (n != 1 || ast->sample_size == 0)
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continue;
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while (max < 1024)
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max += max;
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pos = st->index_entries[0].pos;
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size = st->index_entries[0].size;
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ts = st->index_entries[0].timestamp;
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for (j = 0; j < size; j += max)
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av_add_index_entry(st, pos + j, ts + j, FFMIN(max, size - j), 0,
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AVINDEX_KEYFRAME);
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}
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}
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static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag,
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uint32_t size)
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{
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AVIOContext *pb = s->pb;
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char key[5] = { 0 };
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char *value;
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size += (size & 1);
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if (size == UINT_MAX)
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return AVERROR(EINVAL);
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value = av_malloc(size + 1);
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if (!value)
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return AVERROR(ENOMEM);
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avio_read(pb, value, size);
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value[size] = 0;
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AV_WL32(key, tag);
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return av_dict_set(st ? &st->metadata : &s->metadata, key, value,
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AV_DICT_DONT_STRDUP_VAL);
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}
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static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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static void avi_metadata_creation_time(AVDictionary **metadata, char *date)
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{
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char month[4], time[9], buffer[64];
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int i, day, year;
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/* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
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if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
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month, &day, time, &year) == 4) {
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for (i = 0; i < 12; i++)
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if (!av_strcasecmp(month, months[i])) {
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snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
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year, i + 1, day, time);
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av_dict_set(metadata, "creation_time", buffer, 0);
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}
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} else if (date[4] == '/' && date[7] == '/') {
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date[4] = date[7] = '-';
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av_dict_set(metadata, "creation_time", date, 0);
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}
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}
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static void avi_read_nikon(AVFormatContext *s, uint64_t end)
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{
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while (avio_tell(s->pb) < end) {
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uint32_t tag = avio_rl32(s->pb);
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uint32_t size = avio_rl32(s->pb);
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switch (tag) {
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case MKTAG('n', 'c', 't', 'g'): /* Nikon Tags */
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{
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uint64_t tag_end = avio_tell(s->pb) + size;
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while (avio_tell(s->pb) < tag_end) {
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uint16_t tag = avio_rl16(s->pb);
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uint16_t size = avio_rl16(s->pb);
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const char *name = NULL;
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char buffer[64] = { 0 };
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size -= avio_read(s->pb, buffer,
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FFMIN(size, sizeof(buffer) - 1));
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switch (tag) {
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case 0x03:
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name = "maker";
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break;
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case 0x04:
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name = "model";
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break;
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case 0x13:
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name = "creation_time";
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if (buffer[4] == ':' && buffer[7] == ':')
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buffer[4] = buffer[7] = '-';
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break;
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}
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if (name)
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av_dict_set(&s->metadata, name, buffer, 0);
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avio_skip(s->pb, size);
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}
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break;
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}
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default:
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avio_skip(s->pb, size);
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break;
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}
|
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}
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}
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static int avi_read_header(AVFormatContext *s)
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{
|
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AVIContext *avi = s->priv_data;
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AVIOContext *pb = s->pb;
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unsigned int tag, tag1, handler;
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int codec_type, stream_index, frame_period;
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unsigned int size;
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int i;
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AVStream *st;
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AVIStream *ast = NULL;
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int avih_width = 0, avih_height = 0;
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int amv_file_format = 0;
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uint64_t list_end = 0;
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int ret;
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avi->stream_index = -1;
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|
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ret = get_riff(s, pb);
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if (ret < 0)
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return ret;
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|
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avi->fsize = avio_size(pb);
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if (avi->fsize <= 0)
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avi->fsize = avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
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|
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/* first list tag */
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stream_index = -1;
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codec_type = -1;
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frame_period = 0;
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for (;;) {
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if (pb->eof_reached)
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goto fail;
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tag = avio_rl32(pb);
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size = avio_rl32(pb);
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print_tag("tag", tag, size);
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switch (tag) {
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case MKTAG('L', 'I', 'S', 'T'):
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list_end = avio_tell(pb) + size;
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/* Ignored, except at start of video packets. */
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tag1 = avio_rl32(pb);
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print_tag("list", tag1, 0);
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if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
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avi->movi_list = avio_tell(pb) - 4;
|
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if (size)
|
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avi->movi_end = avi->movi_list + size + (size & 1);
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else
|
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avi->movi_end = avio_size(pb);
|
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av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
|
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goto end_of_header;
|
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} else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
|
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ff_read_riff_info(s, size - 4);
|
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else if (tag1 == MKTAG('n', 'c', 'd', 't'))
|
|
avi_read_nikon(s, list_end);
|
|
|
|
break;
|
|
case MKTAG('I', 'D', 'I', 'T'):
|
|
{
|
|
unsigned char date[64] = { 0 };
|
|
size += (size & 1);
|
|
size -= avio_read(pb, date, FFMIN(size, sizeof(date) - 1));
|
|
avio_skip(pb, size);
|
|
avi_metadata_creation_time(&s->metadata, date);
|
|
break;
|
|
}
|
|
case MKTAG('d', 'm', 'l', 'h'):
|
|
avi->is_odml = 1;
|
|
avio_skip(pb, size + (size & 1));
|
|
break;
|
|
case MKTAG('a', 'm', 'v', 'h'):
|
|
amv_file_format = 1;
|
|
case MKTAG('a', 'v', 'i', 'h'):
|
|
/* AVI header */
|
|
/* using frame_period is bad idea */
|
|
frame_period = avio_rl32(pb);
|
|
avio_skip(pb, 4);
|
|
avio_rl32(pb);
|
|
avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX;
|
|
|
|
avio_skip(pb, 2 * 4);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avih_width = avio_rl32(pb);
|
|
avih_height = avio_rl32(pb);
|
|
|
|
avio_skip(pb, size - 10 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'h'):
|
|
/* stream header */
|
|
|
|
tag1 = avio_rl32(pb);
|
|
handler = avio_rl32(pb); /* codec tag */
|
|
|
|
if (tag1 == MKTAG('p', 'a', 'd', 's')) {
|
|
avio_skip(pb, size - 8);
|
|
break;
|
|
} else {
|
|
stream_index++;
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
goto fail;
|
|
|
|
st->id = stream_index;
|
|
ast = av_mallocz(sizeof(AVIStream));
|
|
if (!ast)
|
|
goto fail;
|
|
st->priv_data = ast;
|
|
}
|
|
if (amv_file_format)
|
|
tag1 = stream_index ? MKTAG('a', 'u', 'd', 's')
|
|
: MKTAG('v', 'i', 'd', 's');
|
|
|
|
print_tag("strh", tag1, -1);
|
|
|
|
if (tag1 == MKTAG('i', 'a', 'v', 's') ||
|
|
tag1 == MKTAG('i', 'v', 'a', 's')) {
|
|
int64_t dv_dur;
|
|
|
|
/* After some consideration -- I don't think we
|
|
* have to support anything but DV in type1 AVIs. */
|
|
if (s->nb_streams != 1)
|
|
goto fail;
|
|
|
|
if (handler != MKTAG('d', 'v', 's', 'd') &&
|
|
handler != MKTAG('d', 'v', 'h', 'd') &&
|
|
handler != MKTAG('d', 'v', 's', 'l'))
|
|
goto fail;
|
|
|
|
ast = s->streams[0]->priv_data;
|
|
av_freep(&s->streams[0]->codec->extradata);
|
|
av_freep(&s->streams[0]->codec);
|
|
av_freep(&s->streams[0]);
|
|
s->nb_streams = 0;
|
|
if (CONFIG_DV_DEMUXER) {
|
|
avi->dv_demux = avpriv_dv_init_demux(s);
|
|
if (!avi->dv_demux)
|
|
goto fail;
|
|
}
|
|
s->streams[0]->priv_data = ast;
|
|
avio_skip(pb, 3 * 4);
|
|
ast->scale = avio_rl32(pb);
|
|
ast->rate = avio_rl32(pb);
|
|
avio_skip(pb, 4); /* start time */
|
|
|
|
dv_dur = avio_rl32(pb);
|
|
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
|
|
dv_dur *= AV_TIME_BASE;
|
|
s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
|
|
}
|
|
/* else, leave duration alone; timing estimation in utils.c
|
|
* will make a guess based on bitrate. */
|
|
|
|
stream_index = s->nb_streams - 1;
|
|
avio_skip(pb, size - 9 * 4);
|
|
break;
|
|
}
|
|
|
|
assert(stream_index < s->nb_streams);
|
|
st->codec->stream_codec_tag = handler;
|
|
|
|
avio_rl32(pb); /* flags */
|
|
avio_rl16(pb); /* priority */
|
|
avio_rl16(pb); /* language */
|
|
avio_rl32(pb); /* initial frame */
|
|
ast->scale = avio_rl32(pb);
|
|
ast->rate = avio_rl32(pb);
|
|
if (!(ast->scale && ast->rate)) {
|
|
av_log(s, AV_LOG_WARNING,
|
|
"scale/rate is %u/%u which is invalid. "
|
|
"(This file has been generated by broken software.)\n",
|
|
ast->scale,
|
|
ast->rate);
|
|
if (frame_period) {
|
|
ast->rate = 1000000;
|
|
ast->scale = frame_period;
|
|
} else {
|
|
ast->rate = 25;
|
|
ast->scale = 1;
|
|
}
|
|
}
|
|
avpriv_set_pts_info(st, 64, ast->scale, ast->rate);
|
|
|
|
ast->cum_len = avio_rl32(pb); /* start */
|
|
st->nb_frames = avio_rl32(pb);
|
|
|
|
st->start_time = 0;
|
|
avio_rl32(pb); /* buffer size */
|
|
avio_rl32(pb); /* quality */
|
|
ast->sample_size = avio_rl32(pb); /* sample ssize */
|
|
ast->cum_len *= FFMAX(1, ast->sample_size);
|
|
av_dlog(s, "%"PRIu32" %"PRIu32" %d\n",
|
|
ast->rate, ast->scale, ast->sample_size);
|
|
|
|
switch (tag1) {
|
|
case MKTAG('v', 'i', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_VIDEO;
|
|
|
|
ast->sample_size = 0;
|
|
break;
|
|
case MKTAG('a', 'u', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_AUDIO;
|
|
break;
|
|
case MKTAG('t', 'x', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
break;
|
|
case MKTAG('d', 'a', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_DATA;
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
|
|
goto fail;
|
|
}
|
|
if (ast->sample_size == 0)
|
|
st->duration = st->nb_frames;
|
|
ast->frame_offset = ast->cum_len;
|
|
avio_skip(pb, size - 12 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'f'):
|
|
/* stream header */
|
|
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
|
|
avio_skip(pb, size);
|
|
} else {
|
|
uint64_t cur_pos = avio_tell(pb);
|
|
if (cur_pos < list_end)
|
|
size = FFMIN(size, list_end - cur_pos);
|
|
st = s->streams[stream_index];
|
|
switch (codec_type) {
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
if (amv_file_format) {
|
|
st->codec->width = avih_width;
|
|
st->codec->height = avih_height;
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = AV_CODEC_ID_AMV;
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
tag1 = ff_get_bmp_header(pb, st);
|
|
|
|
if (tag1 == MKTAG('D', 'X', 'S', 'B') ||
|
|
tag1 == MKTAG('D', 'X', 'S', 'A')) {
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = AV_CODEC_ID_XSUB;
|
|
break;
|
|
}
|
|
|
|
if (size > 10 * 4 && size < (1 << 30)) {
|
|
st->codec->extradata_size = size - 10 * 4;
|
|
st->codec->extradata = av_malloc(st->codec->extradata_size +
|
|
FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!st->codec->extradata) {
|
|
st->codec->extradata_size = 0;
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
avio_read(pb,
|
|
st->codec->extradata,
|
|
st->codec->extradata_size);
|
|
}
|
|
|
|
// FIXME: check if the encoder really did this correctly
|
|
if (st->codec->extradata_size & 1)
|
|
avio_r8(pb);
|
|
|
|
/* Extract palette from extradata if bpp <= 8.
|
|
* This code assumes that extradata contains only palette.
|
|
* This is true for all paletted codecs implemented in
|
|
* Libav. */
|
|
if (st->codec->extradata_size &&
|
|
(st->codec->bits_per_coded_sample <= 8)) {
|
|
int pal_size = (1 << st->codec->bits_per_coded_sample) << 2;
|
|
const uint8_t *pal_src;
|
|
|
|
pal_size = FFMIN(pal_size, st->codec->extradata_size);
|
|
pal_src = st->codec->extradata +
|
|
st->codec->extradata_size - pal_size;
|
|
#if HAVE_BIGENDIAN
|
|
for (i = 0; i < pal_size / 4; i++)
|
|
ast->pal[i] = av_bswap32(((uint32_t *)pal_src)[i]);
|
|
#else
|
|
memcpy(ast->pal, pal_src, pal_size);
|
|
#endif
|
|
ast->has_pal = 1;
|
|
}
|
|
|
|
print_tag("video", tag1, 0);
|
|
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags,
|
|
tag1);
|
|
/* This is needed to get the pict type which is necessary
|
|
* for generating correct pts. */
|
|
st->need_parsing = AVSTREAM_PARSE_HEADERS;
|
|
// Support "Resolution 1:1" for Avid AVI Codec
|
|
if (tag1 == MKTAG('A', 'V', 'R', 'n') &&
|
|
st->codec->extradata_size >= 31 &&
|
|
!memcmp(&st->codec->extradata[28], "1:1", 3))
|
|
st->codec->codec_id = AV_CODEC_ID_RAWVIDEO;
|
|
|
|
if (st->codec->codec_tag == 0 && st->codec->height > 0 &&
|
|
st->codec->extradata_size < 1U << 30) {
|
|
st->codec->extradata_size += 9;
|
|
if ((ret = av_reallocp(&st->codec->extradata,
|
|
st->codec->extradata_size +
|
|
FF_INPUT_BUFFER_PADDING_SIZE)) < 0)
|
|
return ret;
|
|
else
|
|
memcpy(st->codec->extradata + st->codec->extradata_size - 9,
|
|
"BottomUp", 9);
|
|
}
|
|
st->codec->height = FFABS(st->codec->height);
|
|
|
|
// avio_skip(pb, size - 5 * 4);
|
|
break;
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
ret = ff_get_wav_header(pb, st->codec, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
ast->dshow_block_align = st->codec->block_align;
|
|
if (ast->sample_size && st->codec->block_align &&
|
|
ast->sample_size != st->codec->block_align) {
|
|
av_log(s,
|
|
AV_LOG_WARNING,
|
|
"sample size (%d) != block align (%d)\n",
|
|
ast->sample_size,
|
|
st->codec->block_align);
|
|
ast->sample_size = st->codec->block_align;
|
|
}
|
|
/* 2-aligned
|
|
* (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
|
|
if (size & 1)
|
|
avio_skip(pb, 1);
|
|
/* Force parsing as several audio frames can be in
|
|
* one packet and timestamps refer to packet start. */
|
|
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
|
|
/* ADTS header is in extradata, AAC without header must be
|
|
* stored as exact frames. Parser not needed and it will
|
|
* fail. */
|
|
if (st->codec->codec_id == AV_CODEC_ID_AAC &&
|
|
st->codec->extradata_size)
|
|
st->need_parsing = AVSTREAM_PARSE_NONE;
|
|
/* AVI files with Xan DPCM audio (wrongly) declare PCM
|
|
* audio in the header but have Axan as stream_code_tag. */
|
|
if (st->codec->stream_codec_tag == AV_RL32("Axan")) {
|
|
st->codec->codec_id = AV_CODEC_ID_XAN_DPCM;
|
|
st->codec->codec_tag = 0;
|
|
}
|
|
if (amv_file_format) {
|
|
st->codec->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV;
|
|
ast->dshow_block_align = 0;
|
|
}
|
|
break;
|
|
case AVMEDIA_TYPE_SUBTITLE:
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_id = AV_CODEC_ID_PROBE;
|
|
break;
|
|
default:
|
|
st->codec->codec_type = AVMEDIA_TYPE_DATA;
|
|
st->codec->codec_id = AV_CODEC_ID_NONE;
|
|
st->codec->codec_tag = 0;
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case MKTAG('i', 'n', 'd', 'x'):
|
|
i = avio_tell(pb);
|
|
if (pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) &&
|
|
read_braindead_odml_indx(s, 0) < 0 &&
|
|
(s->error_recognition & AV_EF_EXPLODE))
|
|
goto fail;
|
|
avio_seek(pb, i + size, SEEK_SET);
|
|
break;
|
|
case MKTAG('v', 'p', 'r', 'p'):
|
|
if (stream_index < (unsigned)s->nb_streams && size > 9 * 4) {
|
|
AVRational active, active_aspect;
|
|
|
|
st = s->streams[stream_index];
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
avio_rl32(pb);
|
|
|
|
active_aspect.den = avio_rl16(pb);
|
|
active_aspect.num = avio_rl16(pb);
|
|
active.num = avio_rl32(pb);
|
|
active.den = avio_rl32(pb);
|
|
avio_rl32(pb); // nbFieldsPerFrame
|
|
|
|
if (active_aspect.num && active_aspect.den &&
|
|
active.num && active.den) {
|
|
st->sample_aspect_ratio = av_div_q(active_aspect, active);
|
|
av_dlog(s, "vprp %d/%d %d/%d\n",
|
|
active_aspect.num, active_aspect.den,
|
|
active.num, active.den);
|
|
}
|
|
size -= 9 * 4;
|
|
}
|
|
avio_skip(pb, size);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'n'):
|
|
if (s->nb_streams) {
|
|
ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size);
|
|
if (ret < 0)
|
|
return ret;
|
|
break;
|
|
}
|
|
default:
|
|
if (size > 1000000) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Something went wrong during header parsing, "
|
|
"I will ignore it and try to continue anyway.\n");
|
|
if (s->error_recognition & AV_EF_EXPLODE)
|
|
goto fail;
|
|
avi->movi_list = avio_tell(pb) - 4;
|
|
avi->movi_end = avio_size(pb);
|
|
goto end_of_header;
|
|
}
|
|
/* skip tag */
|
|
size += (size & 1);
|
|
avio_skip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
|
|
end_of_header:
|
|
/* check stream number */
|
|
if (stream_index != s->nb_streams - 1) {
|
|
|
|
fail:
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (!avi->index_loaded && pb->seekable)
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
avi->non_interleaved |= guess_ni_flag(s);
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
if (st->nb_index_entries)
|
|
break;
|
|
}
|
|
if (i == s->nb_streams && avi->non_interleaved) {
|
|
av_log(s, AV_LOG_WARNING,
|
|
"Non-interleaved AVI without index, switching to interleaved\n");
|
|
avi->non_interleaved = 0;
|
|
}
|
|
|
|
if (avi->non_interleaved) {
|
|
av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
|
|
clean_index(s);
|
|
}
|
|
|
|
ff_metadata_conv_ctx(s, NULL, avi_metadata_conv);
|
|
ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_gab2_sub(AVStream *st, AVPacket *pkt)
|
|
{
|
|
if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) {
|
|
uint8_t desc[256];
|
|
int score = AVPROBE_SCORE_EXTENSION, ret;
|
|
AVIStream *ast = st->priv_data;
|
|
AVInputFormat *sub_demuxer;
|
|
AVRational time_base;
|
|
AVIOContext *pb = avio_alloc_context(pkt->data + 7,
|
|
pkt->size - 7,
|
|
0, NULL, NULL, NULL, NULL);
|
|
AVProbeData pd;
|
|
unsigned int desc_len = avio_rl32(pb);
|
|
|
|
if (desc_len > pb->buf_end - pb->buf_ptr)
|
|
goto error;
|
|
|
|
ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc));
|
|
avio_skip(pb, desc_len - ret);
|
|
if (*desc)
|
|
av_dict_set(&st->metadata, "title", desc, 0);
|
|
|
|
avio_rl16(pb); /* flags? */
|
|
avio_rl32(pb); /* data size */
|
|
|
|
pd = (AVProbeData) { .buf = pb->buf_ptr,
|
|
.buf_size = pb->buf_end - pb->buf_ptr };
|
|
if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
|
|
goto error;
|
|
|
|
if (!(ast->sub_ctx = avformat_alloc_context()))
|
|
goto error;
|
|
|
|
ast->sub_ctx->pb = pb;
|
|
if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) {
|
|
ff_read_packet(ast->sub_ctx, &ast->sub_pkt);
|
|
*st->codec = *ast->sub_ctx->streams[0]->codec;
|
|
ast->sub_ctx->streams[0]->codec->extradata = NULL;
|
|
time_base = ast->sub_ctx->streams[0]->time_base;
|
|
avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
|
|
}
|
|
ast->sub_buffer = pkt->data;
|
|
memset(pkt, 0, sizeof(*pkt));
|
|
return 1;
|
|
|
|
error:
|
|
av_freep(&pb);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
|
|
AVPacket *pkt)
|
|
{
|
|
AVIStream *ast, *next_ast = next_st->priv_data;
|
|
int64_t ts, next_ts, ts_min = INT64_MAX;
|
|
AVStream *st, *sub_st = NULL;
|
|
int i;
|
|
|
|
next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
|
|
AV_TIME_BASE_Q);
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
st = s->streams[i];
|
|
ast = st->priv_data;
|
|
if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
|
|
ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
|
|
if (ts <= next_ts && ts < ts_min) {
|
|
ts_min = ts;
|
|
sub_st = st;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sub_st) {
|
|
ast = sub_st->priv_data;
|
|
*pkt = ast->sub_pkt;
|
|
pkt->stream_index = sub_st->index;
|
|
|
|
if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
|
|
ast->sub_pkt.data = NULL;
|
|
}
|
|
return sub_st;
|
|
}
|
|
|
|
static int get_stream_idx(int *d)
|
|
{
|
|
if (d[0] >= '0' && d[0] <= '9' &&
|
|
d[1] >= '0' && d[1] <= '9') {
|
|
return (d[0] - '0') * 10 + (d[1] - '0');
|
|
} else {
|
|
return 100; // invalid stream ID
|
|
}
|
|
}
|
|
|
|
static int avi_sync(AVFormatContext *s, int exit_early)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int n;
|
|
unsigned int d[8];
|
|
unsigned int size;
|
|
int64_t i, sync;
|
|
|
|
start_sync:
|
|
memset(d, -1, sizeof(d));
|
|
for (i = sync = avio_tell(pb); !pb->eof_reached; i++) {
|
|
int j;
|
|
|
|
for (j = 0; j < 7; j++)
|
|
d[j] = d[j + 1];
|
|
d[7] = avio_r8(pb);
|
|
|
|
size = d[4] + (d[5] << 8) + (d[6] << 16) + (d[7] << 24);
|
|
|
|
n = get_stream_idx(d + 2);
|
|
av_dlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n",
|
|
d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
|
|
if (i + (uint64_t)size > avi->fsize || d[0] > 127)
|
|
continue;
|
|
|
|
// parse ix##
|
|
if ((d[0] == 'i' && d[1] == 'x' && n < s->nb_streams) ||
|
|
// parse JUNK
|
|
(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||
|
|
(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')) {
|
|
avio_skip(pb, size);
|
|
goto start_sync;
|
|
}
|
|
|
|
// parse stray LIST
|
|
if (d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T') {
|
|
avio_skip(pb, 4);
|
|
goto start_sync;
|
|
}
|
|
|
|
n = get_stream_idx(d);
|
|
|
|
if (!((i - avi->last_pkt_pos) & 1) &&
|
|
get_stream_idx(d + 1) < s->nb_streams)
|
|
continue;
|
|
|
|
// detect ##ix chunk and skip
|
|
if (d[2] == 'i' && d[3] == 'x' && n < s->nb_streams) {
|
|
avio_skip(pb, size);
|
|
goto start_sync;
|
|
}
|
|
|
|
// parse ##dc/##wb
|
|
if (n < s->nb_streams) {
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
st = s->streams[n];
|
|
ast = st->priv_data;
|
|
|
|
if (s->nb_streams >= 2) {
|
|
AVStream *st1 = s->streams[1];
|
|
AVIStream *ast1 = st1->priv_data;
|
|
// workaround for broken small-file-bug402.avi
|
|
if (d[2] == 'w' && d[3] == 'b' && n == 0 &&
|
|
st->codec->codec_type == AVMEDIA_TYPE_VIDEO &&
|
|
st1->codec->codec_type == AVMEDIA_TYPE_AUDIO &&
|
|
ast->prefix == 'd' * 256 + 'c' &&
|
|
(d[2] * 256 + d[3] == ast1->prefix ||
|
|
!ast1->prefix_count)) {
|
|
n = 1;
|
|
st = st1;
|
|
ast = ast1;
|
|
av_log(s, AV_LOG_WARNING,
|
|
"Invalid stream + prefix combination, assuming audio.\n");
|
|
}
|
|
}
|
|
|
|
if (!avi->dv_demux &&
|
|
((st->discard >= AVDISCARD_DEFAULT && size == 0) /* ||
|
|
// FIXME: needs a little reordering
|
|
(st->discard >= AVDISCARD_NONKEY &&
|
|
!(pkt->flags & AV_PKT_FLAG_KEY)) */
|
|
|| st->discard >= AVDISCARD_ALL)) {
|
|
if (!exit_early) {
|
|
ast->frame_offset += get_duration(ast, size);
|
|
}
|
|
avio_skip(pb, size);
|
|
goto start_sync;
|
|
}
|
|
|
|
if (d[2] == 'p' && d[3] == 'c' && size <= 4 * 256 + 4) {
|
|
int k = avio_r8(pb);
|
|
int last = (k + avio_r8(pb) - 1) & 0xFF;
|
|
|
|
avio_rl16(pb); // flags
|
|
|
|
// b + (g << 8) + (r << 16);
|
|
for (; k <= last; k++)
|
|
ast->pal[k] = avio_rb32(pb) >> 8;
|
|
|
|
ast->has_pal = 1;
|
|
goto start_sync;
|
|
} else if (((ast->prefix_count < 5 || sync + 9 > i) &&
|
|
d[2] < 128 && d[3] < 128) ||
|
|
d[2] * 256 + d[3] == ast->prefix /* ||
|
|
(d[2] == 'd' && d[3] == 'c') ||
|
|
(d[2] == 'w' && d[3] == 'b') */) {
|
|
if (exit_early)
|
|
return 0;
|
|
if (d[2] * 256 + d[3] == ast->prefix)
|
|
ast->prefix_count++;
|
|
else {
|
|
ast->prefix = d[2] * 256 + d[3];
|
|
ast->prefix_count = 0;
|
|
}
|
|
|
|
avi->stream_index = n;
|
|
ast->packet_size = size + 8;
|
|
ast->remaining = size;
|
|
|
|
if (size || !ast->sample_size) {
|
|
uint64_t pos = avio_tell(pb) - 8;
|
|
if (!st->index_entries || !st->nb_index_entries ||
|
|
st->index_entries[st->nb_index_entries - 1].pos < pos) {
|
|
av_add_index_entry(st, pos, ast->frame_offset, size,
|
|
0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int err;
|
|
#if FF_API_DESTRUCT_PACKET
|
|
void *dstr;
|
|
#endif
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
int size = avpriv_dv_get_packet(avi->dv_demux, pkt);
|
|
if (size >= 0)
|
|
return size;
|
|
}
|
|
|
|
if (avi->non_interleaved) {
|
|
int best_stream_index = 0;
|
|
AVStream *best_st = NULL;
|
|
AVIStream *best_ast;
|
|
int64_t best_ts = INT64_MAX;
|
|
int i;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
int64_t ts = ast->frame_offset;
|
|
int64_t last_ts;
|
|
|
|
if (!st->nb_index_entries)
|
|
continue;
|
|
|
|
last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
|
|
if (!ast->remaining && ts > last_ts)
|
|
continue;
|
|
|
|
ts = av_rescale_q(ts, st->time_base,
|
|
(AVRational) { FFMAX(1, ast->sample_size),
|
|
AV_TIME_BASE });
|
|
|
|
av_dlog(s, "%"PRId64" %d/%d %"PRId64"\n", ts,
|
|
st->time_base.num, st->time_base.den, ast->frame_offset);
|
|
if (ts < best_ts) {
|
|
best_ts = ts;
|
|
best_st = st;
|
|
best_stream_index = i;
|
|
}
|
|
}
|
|
if (!best_st)
|
|
return AVERROR_EOF;
|
|
|
|
best_ast = best_st->priv_data;
|
|
best_ts = av_rescale_q(best_ts,
|
|
(AVRational) { FFMAX(1, best_ast->sample_size),
|
|
AV_TIME_BASE },
|
|
best_st->time_base);
|
|
if (best_ast->remaining) {
|
|
i = av_index_search_timestamp(best_st,
|
|
best_ts,
|
|
AVSEEK_FLAG_ANY |
|
|
AVSEEK_FLAG_BACKWARD);
|
|
} else {
|
|
i = av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
|
|
if (i >= 0)
|
|
best_ast->frame_offset = best_st->index_entries[i].timestamp;
|
|
}
|
|
|
|
if (i >= 0) {
|
|
int64_t pos = best_st->index_entries[i].pos;
|
|
pos += best_ast->packet_size - best_ast->remaining;
|
|
avio_seek(s->pb, pos + 8, SEEK_SET);
|
|
|
|
assert(best_ast->remaining <= best_ast->packet_size);
|
|
|
|
avi->stream_index = best_stream_index;
|
|
if (!best_ast->remaining)
|
|
best_ast->packet_size =
|
|
best_ast->remaining = best_st->index_entries[i].size;
|
|
}
|
|
}
|
|
|
|
resync:
|
|
if (avi->stream_index >= 0) {
|
|
AVStream *st = s->streams[avi->stream_index];
|
|
AVIStream *ast = st->priv_data;
|
|
int size, err;
|
|
|
|
if (get_subtitle_pkt(s, st, pkt))
|
|
return 0;
|
|
|
|
// minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
|
|
if (ast->sample_size <= 1)
|
|
size = INT_MAX;
|
|
else if (ast->sample_size < 32)
|
|
// arbitrary multiplier to avoid tiny packets for raw PCM data
|
|
size = 1024 * ast->sample_size;
|
|
else
|
|
size = ast->sample_size;
|
|
|
|
if (size > ast->remaining)
|
|
size = ast->remaining;
|
|
avi->last_pkt_pos = avio_tell(pb);
|
|
err = av_get_packet(pb, pkt, size);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (ast->has_pal && pkt->data && pkt->size < (unsigned)INT_MAX / 2) {
|
|
uint8_t *pal;
|
|
pal = av_packet_new_side_data(pkt,
|
|
AV_PKT_DATA_PALETTE,
|
|
AVPALETTE_SIZE);
|
|
if (!pal) {
|
|
av_log(s, AV_LOG_ERROR,
|
|
"Failed to allocate data for palette\n");
|
|
} else {
|
|
memcpy(pal, ast->pal, AVPALETTE_SIZE);
|
|
ast->has_pal = 0;
|
|
}
|
|
}
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
AVBufferRef *avbuf = pkt->buf;
|
|
#if FF_API_DESTRUCT_PACKET
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
dstr = pkt->destruct;
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
size = avpriv_dv_produce_packet(avi->dv_demux, pkt,
|
|
pkt->data, pkt->size);
|
|
#if FF_API_DESTRUCT_PACKET
|
|
FF_DISABLE_DEPRECATION_WARNINGS
|
|
pkt->destruct = dstr;
|
|
FF_ENABLE_DEPRECATION_WARNINGS
|
|
#endif
|
|
pkt->buf = avbuf;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
if (size < 0)
|
|
av_free_packet(pkt);
|
|
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE &&
|
|
!st->codec->codec_tag && read_gab2_sub(st, pkt)) {
|
|
ast->frame_offset++;
|
|
avi->stream_index = -1;
|
|
ast->remaining = 0;
|
|
goto resync;
|
|
} else {
|
|
/* XXX: How to handle B-frames in AVI? */
|
|
pkt->dts = ast->frame_offset;
|
|
// pkt->dts += ast->start;
|
|
if (ast->sample_size)
|
|
pkt->dts /= ast->sample_size;
|
|
av_dlog(s,
|
|
"dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d "
|
|
"base:%d st:%d size:%d\n",
|
|
pkt->dts,
|
|
ast->frame_offset,
|
|
ast->scale,
|
|
ast->rate,
|
|
ast->sample_size,
|
|
AV_TIME_BASE,
|
|
avi->stream_index,
|
|
size);
|
|
pkt->stream_index = avi->stream_index;
|
|
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
AVIndexEntry *e;
|
|
int index;
|
|
assert(st->index_entries);
|
|
|
|
index = av_index_search_timestamp(st, ast->frame_offset, 0);
|
|
e = &st->index_entries[index];
|
|
|
|
if (index >= 0 && e->timestamp == ast->frame_offset)
|
|
if (e->flags & AVINDEX_KEYFRAME)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
} else {
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
ast->frame_offset += get_duration(ast, pkt->size);
|
|
}
|
|
ast->remaining -= err;
|
|
if (!ast->remaining) {
|
|
avi->stream_index = -1;
|
|
ast->packet_size = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
if ((err = avi_sync(s, 0)) < 0)
|
|
return err;
|
|
goto resync;
|
|
}
|
|
|
|
/* XXX: We make the implicit supposition that the positions are sorted
|
|
* for each stream. */
|
|
static int avi_read_idx1(AVFormatContext *s, int size)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int nb_index_entries, i;
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
unsigned int index, tag, flags, pos, len, first_packet = 1;
|
|
unsigned last_pos = -1;
|
|
int64_t idx1_pos, first_packet_pos = 0, data_offset = 0;
|
|
|
|
nb_index_entries = size / 16;
|
|
if (nb_index_entries <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
idx1_pos = avio_tell(pb);
|
|
avio_seek(pb, avi->movi_list + 4, SEEK_SET);
|
|
if (avi_sync(s, 1) == 0)
|
|
first_packet_pos = avio_tell(pb) - 8;
|
|
avi->stream_index = -1;
|
|
avio_seek(pb, idx1_pos, SEEK_SET);
|
|
|
|
/* Read the entries and sort them in each stream component. */
|
|
for (i = 0; i < nb_index_entries; i++) {
|
|
tag = avio_rl32(pb);
|
|
flags = avio_rl32(pb);
|
|
pos = avio_rl32(pb);
|
|
len = avio_rl32(pb);
|
|
av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
|
|
i, tag, flags, pos, len);
|
|
|
|
index = ((tag & 0xff) - '0') * 10;
|
|
index += (tag >> 8 & 0xff) - '0';
|
|
if (index >= s->nb_streams)
|
|
continue;
|
|
st = s->streams[index];
|
|
ast = st->priv_data;
|
|
|
|
if (first_packet && first_packet_pos && len) {
|
|
data_offset = first_packet_pos - pos;
|
|
first_packet = 0;
|
|
}
|
|
pos += data_offset;
|
|
|
|
av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
|
|
|
|
if (pb->eof_reached)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
if (last_pos == pos)
|
|
avi->non_interleaved = 1;
|
|
else if (len || !ast->sample_size)
|
|
av_add_index_entry(st, pos, ast->cum_len, len, 0,
|
|
(flags & AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
|
|
ast->cum_len += get_duration(ast, len);
|
|
last_pos = pos;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int guess_ni_flag(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
int64_t last_start = 0;
|
|
int64_t first_end = INT64_MAX;
|
|
int64_t oldpos = avio_tell(s->pb);
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
int n = st->nb_index_entries;
|
|
unsigned int size;
|
|
|
|
if (n <= 0)
|
|
continue;
|
|
|
|
if (n >= 2) {
|
|
int64_t pos = st->index_entries[0].pos;
|
|
avio_seek(s->pb, pos + 4, SEEK_SET);
|
|
size = avio_rl32(s->pb);
|
|
if (pos + size > st->index_entries[1].pos)
|
|
last_start = INT64_MAX;
|
|
}
|
|
|
|
if (st->index_entries[0].pos > last_start)
|
|
last_start = st->index_entries[0].pos;
|
|
if (st->index_entries[n - 1].pos < first_end)
|
|
first_end = st->index_entries[n - 1].pos;
|
|
}
|
|
avio_seek(s->pb, oldpos, SEEK_SET);
|
|
return last_start > first_end;
|
|
}
|
|
|
|
static int avi_load_index(AVFormatContext *s)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
uint32_t tag, size;
|
|
int64_t pos = avio_tell(pb);
|
|
int ret = -1;
|
|
|
|
if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0)
|
|
goto the_end; // maybe truncated file
|
|
av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end);
|
|
for (;;) {
|
|
if (pb->eof_reached)
|
|
break;
|
|
tag = avio_rl32(pb);
|
|
size = avio_rl32(pb);
|
|
av_dlog(s, "tag=%c%c%c%c size=0x%x\n",
|
|
tag & 0xff,
|
|
(tag >> 8) & 0xff,
|
|
(tag >> 16) & 0xff,
|
|
(tag >> 24) & 0xff,
|
|
size);
|
|
|
|
if (tag == MKTAG('i', 'd', 'x', '1') &&
|
|
avi_read_idx1(s, size) >= 0) {
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
size += (size & 1);
|
|
if (avio_skip(pb, size) < 0)
|
|
break; // something is wrong here
|
|
}
|
|
|
|
the_end:
|
|
avio_seek(pb, pos, SEEK_SET);
|
|
return ret;
|
|
}
|
|
|
|
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
|
|
{
|
|
AVIStream *ast2 = st2->priv_data;
|
|
int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
|
|
av_free_packet(&ast2->sub_pkt);
|
|
if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
|
|
avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
|
|
ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
|
|
}
|
|
|
|
static int avi_read_seek(AVFormatContext *s, int stream_index,
|
|
int64_t timestamp, int flags)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVStream *st;
|
|
int i, index;
|
|
int64_t pos;
|
|
AVIStream *ast;
|
|
|
|
if (!avi->index_loaded) {
|
|
/* we only load the index on demand */
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
}
|
|
assert(stream_index >= 0);
|
|
|
|
st = s->streams[stream_index];
|
|
ast = st->priv_data;
|
|
index = av_index_search_timestamp(st,
|
|
timestamp * FFMAX(ast->sample_size, 1),
|
|
flags);
|
|
if (index < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* find the position */
|
|
pos = st->index_entries[index].pos;
|
|
timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
|
|
|
|
av_dlog(s, "XX %"PRId64" %d %"PRId64"\n",
|
|
timestamp, index, st->index_entries[index].timestamp);
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
/* One and only one real stream for DV in AVI, and it has video */
|
|
/* offsets. Calling with other stream indexes should have failed */
|
|
/* the av_index_search_timestamp call above. */
|
|
assert(stream_index == 0);
|
|
|
|
/* Feed the DV video stream version of the timestamp to the */
|
|
/* DV demux so it can synthesize correct timestamps. */
|
|
ff_dv_offset_reset(avi->dv_demux, timestamp);
|
|
|
|
avio_seek(s->pb, pos, SEEK_SET);
|
|
avi->stream_index = -1;
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st2 = s->streams[i];
|
|
AVIStream *ast2 = st2->priv_data;
|
|
|
|
ast2->packet_size =
|
|
ast2->remaining = 0;
|
|
|
|
if (ast2->sub_ctx) {
|
|
seek_subtitle(st, st2, timestamp);
|
|
continue;
|
|
}
|
|
|
|
if (st2->nb_index_entries <= 0)
|
|
continue;
|
|
|
|
// assert(st2->codec->block_align);
|
|
assert((int64_t)st2->time_base.num * ast2->rate ==
|
|
(int64_t)st2->time_base.den * ast2->scale);
|
|
index = av_index_search_timestamp(st2,
|
|
av_rescale_q(timestamp,
|
|
st->time_base,
|
|
st2->time_base) *
|
|
FFMAX(ast2->sample_size, 1),
|
|
flags | AVSEEK_FLAG_BACKWARD);
|
|
if (index < 0)
|
|
index = 0;
|
|
|
|
if (!avi->non_interleaved) {
|
|
while (index > 0 && st2->index_entries[index].pos > pos)
|
|
index--;
|
|
while (index + 1 < st2->nb_index_entries &&
|
|
st2->index_entries[index].pos < pos)
|
|
index++;
|
|
}
|
|
|
|
av_dlog(s, "%"PRId64" %d %"PRId64"\n",
|
|
timestamp, index, st2->index_entries[index].timestamp);
|
|
/* extract the current frame number */
|
|
ast2->frame_offset = st2->index_entries[index].timestamp;
|
|
}
|
|
|
|
/* do the seek */
|
|
avio_seek(s->pb, pos, SEEK_SET);
|
|
avi->stream_index = -1;
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_close(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
AVIContext *avi = s->priv_data;
|
|
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
if (ast) {
|
|
if (ast->sub_ctx) {
|
|
av_freep(&ast->sub_ctx->pb);
|
|
avformat_close_input(&ast->sub_ctx);
|
|
}
|
|
av_free(ast->sub_buffer);
|
|
av_free_packet(&ast->sub_pkt);
|
|
}
|
|
}
|
|
|
|
av_free(avi->dv_demux);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int avi_probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
|
|
/* check file header */
|
|
for (i = 0; avi_headers[i][0]; i++)
|
|
if (!memcmp(p->buf, avi_headers[i], 4) &&
|
|
!memcmp(p->buf + 8, avi_headers[i] + 4, 4))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat ff_avi_demuxer = {
|
|
.name = "avi",
|
|
.long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"),
|
|
.priv_data_size = sizeof(AVIContext),
|
|
.read_probe = avi_probe,
|
|
.read_header = avi_read_header,
|
|
.read_packet = avi_read_packet,
|
|
.read_close = avi_read_close,
|
|
.read_seek = avi_read_seek,
|
|
};
|