638 lines
20 KiB
C
638 lines
20 KiB
C
/*
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* Interplay MVE File Demuxer
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* Copyright (c) 2003 The ffmpeg Project
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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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/**
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* @file
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* Interplay MVE file demuxer
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* by Mike Melanson (melanson@pcisys.net)
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* For more information regarding the Interplay MVE file format, visit:
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* http://www.pcisys.net/~melanson/codecs/
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* The aforementioned site also contains a command line utility for parsing
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* IP MVE files so that you can get a good idea of the typical structure of
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* such files. This demuxer is not the best example to use if you are trying
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* to write your own as it uses a rather roundabout approach for splitting
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* up and sending out the chunks.
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*/
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#include "libavutil/intreadwrite.h"
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#include "avformat.h"
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/* debugging support: #define DEBUG_IPMOVIE as non-zero to see extremely
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* verbose information about the demux process */
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#define DEBUG_IPMOVIE 0
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#if DEBUG_IPMOVIE
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#undef printf
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#define debug_ipmovie printf
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#else
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static inline void debug_ipmovie(const char *format, ...) { }
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#endif
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#define CHUNK_PREAMBLE_SIZE 4
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#define OPCODE_PREAMBLE_SIZE 4
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#define CHUNK_INIT_AUDIO 0x0000
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#define CHUNK_AUDIO_ONLY 0x0001
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#define CHUNK_INIT_VIDEO 0x0002
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#define CHUNK_VIDEO 0x0003
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#define CHUNK_SHUTDOWN 0x0004
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#define CHUNK_END 0x0005
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/* these last types are used internally */
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#define CHUNK_DONE 0xFFFC
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#define CHUNK_NOMEM 0xFFFD
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#define CHUNK_EOF 0xFFFE
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#define CHUNK_BAD 0xFFFF
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#define OPCODE_END_OF_STREAM 0x00
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#define OPCODE_END_OF_CHUNK 0x01
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#define OPCODE_CREATE_TIMER 0x02
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#define OPCODE_INIT_AUDIO_BUFFERS 0x03
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#define OPCODE_START_STOP_AUDIO 0x04
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#define OPCODE_INIT_VIDEO_BUFFERS 0x05
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#define OPCODE_UNKNOWN_06 0x06
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#define OPCODE_SEND_BUFFER 0x07
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#define OPCODE_AUDIO_FRAME 0x08
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#define OPCODE_SILENCE_FRAME 0x09
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#define OPCODE_INIT_VIDEO_MODE 0x0A
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#define OPCODE_CREATE_GRADIENT 0x0B
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#define OPCODE_SET_PALETTE 0x0C
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#define OPCODE_SET_PALETTE_COMPRESSED 0x0D
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#define OPCODE_UNKNOWN_0E 0x0E
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#define OPCODE_SET_DECODING_MAP 0x0F
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#define OPCODE_UNKNOWN_10 0x10
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#define OPCODE_VIDEO_DATA 0x11
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#define OPCODE_UNKNOWN_12 0x12
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#define OPCODE_UNKNOWN_13 0x13
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#define OPCODE_UNKNOWN_14 0x14
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#define OPCODE_UNKNOWN_15 0x15
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#define PALETTE_COUNT 256
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typedef struct IPMVEContext {
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unsigned char *buf;
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int buf_size;
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uint64_t frame_pts_inc;
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unsigned int video_bpp;
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unsigned int video_width;
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unsigned int video_height;
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int64_t video_pts;
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uint32_t palette[256];
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int has_palette;
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unsigned int audio_bits;
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unsigned int audio_channels;
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unsigned int audio_sample_rate;
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enum CodecID audio_type;
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unsigned int audio_frame_count;
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int video_stream_index;
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int audio_stream_index;
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int64_t audio_chunk_offset;
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int audio_chunk_size;
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int64_t video_chunk_offset;
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int video_chunk_size;
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int64_t decode_map_chunk_offset;
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int decode_map_chunk_size;
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int64_t next_chunk_offset;
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} IPMVEContext;
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static int load_ipmovie_packet(IPMVEContext *s, AVIOContext *pb,
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AVPacket *pkt) {
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int chunk_type;
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if (s->audio_chunk_offset) {
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/* adjust for PCM audio by skipping chunk header */
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if (s->audio_type != CODEC_ID_INTERPLAY_DPCM) {
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s->audio_chunk_offset += 6;
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s->audio_chunk_size -= 6;
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}
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avio_seek(pb, s->audio_chunk_offset, SEEK_SET);
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s->audio_chunk_offset = 0;
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if (s->audio_chunk_size != av_get_packet(pb, pkt, s->audio_chunk_size))
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return CHUNK_EOF;
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pkt->stream_index = s->audio_stream_index;
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pkt->pts = s->audio_frame_count;
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/* audio frame maintenance */
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if (s->audio_type != CODEC_ID_INTERPLAY_DPCM)
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s->audio_frame_count +=
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(s->audio_chunk_size / s->audio_channels / (s->audio_bits / 8));
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else
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s->audio_frame_count +=
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(s->audio_chunk_size - 6) / s->audio_channels;
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debug_ipmovie("sending audio frame with pts %"PRId64" (%d audio frames)\n",
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pkt->pts, s->audio_frame_count);
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chunk_type = CHUNK_VIDEO;
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} else if (s->decode_map_chunk_offset) {
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/* send both the decode map and the video data together */
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if (av_new_packet(pkt, s->decode_map_chunk_size + s->video_chunk_size))
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return CHUNK_NOMEM;
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if (s->has_palette) {
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uint8_t *pal;
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pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE,
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AVPALETTE_SIZE);
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if (pal) {
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memcpy(pal, s->palette, AVPALETTE_SIZE);
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s->has_palette = 0;
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}
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}
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pkt->pos= s->decode_map_chunk_offset;
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avio_seek(pb, s->decode_map_chunk_offset, SEEK_SET);
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s->decode_map_chunk_offset = 0;
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if (avio_read(pb, pkt->data, s->decode_map_chunk_size) !=
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s->decode_map_chunk_size) {
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av_free_packet(pkt);
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return CHUNK_EOF;
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}
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avio_seek(pb, s->video_chunk_offset, SEEK_SET);
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s->video_chunk_offset = 0;
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if (avio_read(pb, pkt->data + s->decode_map_chunk_size,
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s->video_chunk_size) != s->video_chunk_size) {
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av_free_packet(pkt);
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return CHUNK_EOF;
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}
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pkt->stream_index = s->video_stream_index;
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pkt->pts = s->video_pts;
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debug_ipmovie("sending video frame with pts %"PRId64"\n",
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pkt->pts);
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s->video_pts += s->frame_pts_inc;
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chunk_type = CHUNK_VIDEO;
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} else {
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avio_seek(pb, s->next_chunk_offset, SEEK_SET);
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chunk_type = CHUNK_DONE;
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}
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return chunk_type;
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}
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/* This function loads and processes a single chunk in an IP movie file.
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* It returns the type of chunk that was processed. */
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static int process_ipmovie_chunk(IPMVEContext *s, AVIOContext *pb,
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AVPacket *pkt)
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{
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unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
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int chunk_type;
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int chunk_size;
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unsigned char opcode_preamble[OPCODE_PREAMBLE_SIZE];
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unsigned char opcode_type;
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unsigned char opcode_version;
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int opcode_size;
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unsigned char scratch[1024];
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int i, j;
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int first_color, last_color;
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int audio_flags;
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unsigned char r, g, b;
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/* see if there are any pending packets */
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chunk_type = load_ipmovie_packet(s, pb, pkt);
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if (chunk_type != CHUNK_DONE)
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return chunk_type;
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/* read the next chunk, wherever the file happens to be pointing */
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if (pb->eof_reached)
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return CHUNK_EOF;
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if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
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CHUNK_PREAMBLE_SIZE)
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return CHUNK_BAD;
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chunk_size = AV_RL16(&chunk_preamble[0]);
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chunk_type = AV_RL16(&chunk_preamble[2]);
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debug_ipmovie("chunk type 0x%04X, 0x%04X bytes: ", chunk_type, chunk_size);
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switch (chunk_type) {
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case CHUNK_INIT_AUDIO:
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debug_ipmovie("initialize audio\n");
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break;
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case CHUNK_AUDIO_ONLY:
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debug_ipmovie("audio only\n");
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break;
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case CHUNK_INIT_VIDEO:
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debug_ipmovie("initialize video\n");
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break;
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case CHUNK_VIDEO:
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debug_ipmovie("video (and audio)\n");
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break;
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case CHUNK_SHUTDOWN:
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debug_ipmovie("shutdown\n");
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break;
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case CHUNK_END:
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debug_ipmovie("end\n");
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break;
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default:
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debug_ipmovie("invalid chunk\n");
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chunk_type = CHUNK_BAD;
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break;
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}
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while ((chunk_size > 0) && (chunk_type != CHUNK_BAD)) {
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/* read the next chunk, wherever the file happens to be pointing */
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if (pb->eof_reached) {
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chunk_type = CHUNK_EOF;
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break;
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}
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if (avio_read(pb, opcode_preamble, CHUNK_PREAMBLE_SIZE) !=
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CHUNK_PREAMBLE_SIZE) {
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chunk_type = CHUNK_BAD;
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break;
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}
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opcode_size = AV_RL16(&opcode_preamble[0]);
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opcode_type = opcode_preamble[2];
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opcode_version = opcode_preamble[3];
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chunk_size -= OPCODE_PREAMBLE_SIZE;
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chunk_size -= opcode_size;
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if (chunk_size < 0) {
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debug_ipmovie("chunk_size countdown just went negative\n");
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chunk_type = CHUNK_BAD;
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break;
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}
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debug_ipmovie(" opcode type %02X, version %d, 0x%04X bytes: ",
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opcode_type, opcode_version, opcode_size);
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switch (opcode_type) {
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case OPCODE_END_OF_STREAM:
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debug_ipmovie("end of stream\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_END_OF_CHUNK:
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debug_ipmovie("end of chunk\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_CREATE_TIMER:
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debug_ipmovie("create timer\n");
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if ((opcode_version > 0) || (opcode_size > 6)) {
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debug_ipmovie("bad create_timer opcode\n");
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chunk_type = CHUNK_BAD;
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break;
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}
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if (avio_read(pb, scratch, opcode_size) !=
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opcode_size) {
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chunk_type = CHUNK_BAD;
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break;
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}
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s->frame_pts_inc = ((uint64_t)AV_RL32(&scratch[0])) * AV_RL16(&scratch[4]);
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debug_ipmovie(" %.2f frames/second (timer div = %d, subdiv = %d)\n",
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1000000.0/s->frame_pts_inc, AV_RL32(&scratch[0]), AV_RL16(&scratch[4]));
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break;
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case OPCODE_INIT_AUDIO_BUFFERS:
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debug_ipmovie("initialize audio buffers\n");
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if ((opcode_version > 1) || (opcode_size > 10)) {
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debug_ipmovie("bad init_audio_buffers opcode\n");
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chunk_type = CHUNK_BAD;
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break;
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}
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if (avio_read(pb, scratch, opcode_size) !=
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opcode_size) {
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chunk_type = CHUNK_BAD;
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break;
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}
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s->audio_sample_rate = AV_RL16(&scratch[4]);
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audio_flags = AV_RL16(&scratch[2]);
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/* bit 0 of the flags: 0 = mono, 1 = stereo */
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s->audio_channels = (audio_flags & 1) + 1;
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/* bit 1 of the flags: 0 = 8 bit, 1 = 16 bit */
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s->audio_bits = (((audio_flags >> 1) & 1) + 1) * 8;
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/* bit 2 indicates compressed audio in version 1 opcode */
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if ((opcode_version == 1) && (audio_flags & 0x4))
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s->audio_type = CODEC_ID_INTERPLAY_DPCM;
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else if (s->audio_bits == 16)
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s->audio_type = CODEC_ID_PCM_S16LE;
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else
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s->audio_type = CODEC_ID_PCM_U8;
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debug_ipmovie("audio: %d bits, %d Hz, %s, %s format\n",
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s->audio_bits,
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s->audio_sample_rate,
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(s->audio_channels == 2) ? "stereo" : "mono",
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(s->audio_type == CODEC_ID_INTERPLAY_DPCM) ?
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"Interplay audio" : "PCM");
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break;
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case OPCODE_START_STOP_AUDIO:
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debug_ipmovie("start/stop audio\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_INIT_VIDEO_BUFFERS:
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debug_ipmovie("initialize video buffers\n");
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if ((opcode_version > 2) || (opcode_size > 8)) {
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debug_ipmovie("bad init_video_buffers opcode\n");
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chunk_type = CHUNK_BAD;
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break;
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}
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if (avio_read(pb, scratch, opcode_size) !=
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opcode_size) {
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chunk_type = CHUNK_BAD;
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break;
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}
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s->video_width = AV_RL16(&scratch[0]) * 8;
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s->video_height = AV_RL16(&scratch[2]) * 8;
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if (opcode_version < 2 || !AV_RL16(&scratch[6])) {
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s->video_bpp = 8;
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} else {
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s->video_bpp = 16;
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}
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debug_ipmovie("video resolution: %d x %d\n",
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s->video_width, s->video_height);
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break;
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case OPCODE_UNKNOWN_06:
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case OPCODE_UNKNOWN_0E:
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case OPCODE_UNKNOWN_10:
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case OPCODE_UNKNOWN_12:
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case OPCODE_UNKNOWN_13:
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case OPCODE_UNKNOWN_14:
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case OPCODE_UNKNOWN_15:
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debug_ipmovie("unknown (but documented) opcode %02X\n", opcode_type);
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_SEND_BUFFER:
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debug_ipmovie("send buffer\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_AUDIO_FRAME:
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debug_ipmovie("audio frame\n");
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/* log position and move on for now */
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s->audio_chunk_offset = avio_tell(pb);
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s->audio_chunk_size = opcode_size;
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_SILENCE_FRAME:
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debug_ipmovie("silence frame\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_INIT_VIDEO_MODE:
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debug_ipmovie("initialize video mode\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_CREATE_GRADIENT:
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debug_ipmovie("create gradient\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_SET_PALETTE:
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debug_ipmovie("set palette\n");
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/* check for the logical maximum palette size
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* (3 * 256 + 4 bytes) */
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if (opcode_size > 0x304) {
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debug_ipmovie("demux_ipmovie: set_palette opcode too large\n");
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chunk_type = CHUNK_BAD;
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break;
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}
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if (avio_read(pb, scratch, opcode_size) != opcode_size) {
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chunk_type = CHUNK_BAD;
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break;
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}
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/* load the palette into internal data structure */
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first_color = AV_RL16(&scratch[0]);
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last_color = first_color + AV_RL16(&scratch[2]) - 1;
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/* sanity check (since they are 16 bit values) */
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if ((first_color > 0xFF) || (last_color > 0xFF)) {
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debug_ipmovie("demux_ipmovie: set_palette indexes out of range (%d -> %d)\n",
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first_color, last_color);
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chunk_type = CHUNK_BAD;
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break;
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}
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j = 4; /* offset of first palette data */
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for (i = first_color; i <= last_color; i++) {
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/* the palette is stored as a 6-bit VGA palette, thus each
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* component is shifted up to a 8-bit range */
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r = scratch[j++] * 4;
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g = scratch[j++] * 4;
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b = scratch[j++] * 4;
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s->palette[i] = (r << 16) | (g << 8) | (b);
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}
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s->has_palette = 1;
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break;
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case OPCODE_SET_PALETTE_COMPRESSED:
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debug_ipmovie("set palette compressed\n");
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_SET_DECODING_MAP:
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debug_ipmovie("set decoding map\n");
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/* log position and move on for now */
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s->decode_map_chunk_offset = avio_tell(pb);
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s->decode_map_chunk_size = opcode_size;
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avio_skip(pb, opcode_size);
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break;
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case OPCODE_VIDEO_DATA:
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debug_ipmovie("set video data\n");
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|
|
|
/* log position and move on for now */
|
|
s->video_chunk_offset = avio_tell(pb);
|
|
s->video_chunk_size = opcode_size;
|
|
avio_skip(pb, opcode_size);
|
|
break;
|
|
|
|
default:
|
|
debug_ipmovie("*** unknown opcode type\n");
|
|
chunk_type = CHUNK_BAD;
|
|
break;
|
|
|
|
}
|
|
}
|
|
|
|
/* make a note of where the stream is sitting */
|
|
s->next_chunk_offset = avio_tell(pb);
|
|
|
|
/* dispatch the first of any pending packets */
|
|
if ((chunk_type == CHUNK_VIDEO) || (chunk_type == CHUNK_AUDIO_ONLY))
|
|
chunk_type = load_ipmovie_packet(s, pb, pkt);
|
|
|
|
return chunk_type;
|
|
}
|
|
|
|
static const char signature[] = "Interplay MVE File\x1A\0\x1A";
|
|
|
|
static int ipmovie_probe(AVProbeData *p)
|
|
{
|
|
uint8_t *b = p->buf;
|
|
uint8_t *b_end = p->buf + p->buf_size - sizeof(signature);
|
|
do {
|
|
if (memcmp(b++, signature, sizeof(signature)) == 0)
|
|
return AVPROBE_SCORE_MAX;
|
|
} while (b < b_end);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ipmovie_read_header(AVFormatContext *s,
|
|
AVFormatParameters *ap)
|
|
{
|
|
IPMVEContext *ipmovie = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
AVPacket pkt;
|
|
AVStream *st;
|
|
unsigned char chunk_preamble[CHUNK_PREAMBLE_SIZE];
|
|
int chunk_type;
|
|
uint8_t signature_buffer[sizeof(signature)];
|
|
|
|
avio_read(pb, signature_buffer, sizeof(signature_buffer));
|
|
while (memcmp(signature_buffer, signature, sizeof(signature))) {
|
|
memmove(signature_buffer, signature_buffer + 1, sizeof(signature_buffer) - 1);
|
|
signature_buffer[sizeof(signature_buffer) - 1] = avio_r8(pb);
|
|
if (pb->eof_reached)
|
|
return AVERROR_EOF;
|
|
}
|
|
/* initialize private context members */
|
|
ipmovie->video_pts = ipmovie->audio_frame_count = 0;
|
|
ipmovie->audio_chunk_offset = ipmovie->video_chunk_offset =
|
|
ipmovie->decode_map_chunk_offset = 0;
|
|
|
|
/* on the first read, this will position the stream at the first chunk */
|
|
ipmovie->next_chunk_offset = avio_tell(pb) + 4;
|
|
|
|
/* process the first chunk which should be CHUNK_INIT_VIDEO */
|
|
if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_VIDEO)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* peek ahead to the next chunk-- if it is an init audio chunk, process
|
|
* it; if it is the first video chunk, this is a silent file */
|
|
if (avio_read(pb, chunk_preamble, CHUNK_PREAMBLE_SIZE) !=
|
|
CHUNK_PREAMBLE_SIZE)
|
|
return AVERROR(EIO);
|
|
chunk_type = AV_RL16(&chunk_preamble[2]);
|
|
avio_seek(pb, -CHUNK_PREAMBLE_SIZE, SEEK_CUR);
|
|
|
|
if (chunk_type == CHUNK_VIDEO)
|
|
ipmovie->audio_type = CODEC_ID_NONE; /* no audio */
|
|
else if (process_ipmovie_chunk(ipmovie, pb, &pkt) != CHUNK_INIT_AUDIO)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* initialize the stream decoders */
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
av_set_pts_info(st, 63, 1, 1000000);
|
|
ipmovie->video_stream_index = st->index;
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_INTERPLAY_VIDEO;
|
|
st->codec->codec_tag = 0; /* no fourcc */
|
|
st->codec->width = ipmovie->video_width;
|
|
st->codec->height = ipmovie->video_height;
|
|
st->codec->bits_per_coded_sample = ipmovie->video_bpp;
|
|
|
|
if (ipmovie->audio_type) {
|
|
st = av_new_stream(s, 0);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
av_set_pts_info(st, 32, 1, ipmovie->audio_sample_rate);
|
|
ipmovie->audio_stream_index = st->index;
|
|
st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codec->codec_id = ipmovie->audio_type;
|
|
st->codec->codec_tag = 0; /* no tag */
|
|
st->codec->channels = ipmovie->audio_channels;
|
|
st->codec->sample_rate = ipmovie->audio_sample_rate;
|
|
st->codec->bits_per_coded_sample = ipmovie->audio_bits;
|
|
st->codec->bit_rate = st->codec->channels * st->codec->sample_rate *
|
|
st->codec->bits_per_coded_sample;
|
|
if (st->codec->codec_id == CODEC_ID_INTERPLAY_DPCM)
|
|
st->codec->bit_rate /= 2;
|
|
st->codec->block_align = st->codec->channels * st->codec->bits_per_coded_sample;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ipmovie_read_packet(AVFormatContext *s,
|
|
AVPacket *pkt)
|
|
{
|
|
IPMVEContext *ipmovie = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int ret;
|
|
|
|
ret = process_ipmovie_chunk(ipmovie, pb, pkt);
|
|
if (ret == CHUNK_BAD)
|
|
ret = AVERROR_INVALIDDATA;
|
|
else if (ret == CHUNK_EOF)
|
|
ret = AVERROR(EIO);
|
|
else if (ret == CHUNK_NOMEM)
|
|
ret = AVERROR(ENOMEM);
|
|
else if (ret == CHUNK_VIDEO)
|
|
ret = 0;
|
|
else
|
|
ret = -1;
|
|
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_ipmovie_demuxer = {
|
|
"ipmovie",
|
|
NULL_IF_CONFIG_SMALL("Interplay MVE format"),
|
|
sizeof(IPMVEContext),
|
|
ipmovie_probe,
|
|
ipmovie_read_header,
|
|
ipmovie_read_packet,
|
|
};
|