805 lines
26 KiB
C
805 lines
26 KiB
C
/*
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* ASF compatible decoder.
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* Copyright (c) 2000, 2001 Fabrice Bellard.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avformat.h"
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#include "avi.h"
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#include "mpegaudio.h"
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#include "asf.h"
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#undef NDEBUG
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#include <assert.h>
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#define FRAME_HEADER_SIZE 17
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// Fix Me! FRAME_HEADER_SIZE may be different.
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static const GUID index_guid = {
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0x33000890, 0xe5b1, 0x11cf, { 0x89, 0xf4, 0x00, 0xa0, 0xc9, 0x03, 0x49, 0xcb },
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};
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/**********************************/
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/* decoding */
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//#define DEBUG
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#ifdef DEBUG
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#define PRINT_IF_GUID(g,cmp) \
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if (!memcmp(g, &cmp, sizeof(GUID))) \
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printf("(GUID: %s) ", #cmp)
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static void print_guid(const GUID *g)
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{
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int i;
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PRINT_IF_GUID(g, asf_header);
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else PRINT_IF_GUID(g, file_header);
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else PRINT_IF_GUID(g, stream_header);
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else PRINT_IF_GUID(g, audio_stream);
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else PRINT_IF_GUID(g, audio_conceal_none);
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else PRINT_IF_GUID(g, video_stream);
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else PRINT_IF_GUID(g, video_conceal_none);
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else PRINT_IF_GUID(g, comment_header);
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else PRINT_IF_GUID(g, codec_comment_header);
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else PRINT_IF_GUID(g, codec_comment1_header);
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else PRINT_IF_GUID(g, data_header);
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else PRINT_IF_GUID(g, index_guid);
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else PRINT_IF_GUID(g, head1_guid);
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else PRINT_IF_GUID(g, head2_guid);
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else PRINT_IF_GUID(g, my_guid);
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else
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printf("(GUID: unknown) ");
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printf("0x%08x, 0x%04x, 0x%04x, {", g->v1, g->v2, g->v3);
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for(i=0;i<8;i++)
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printf(" 0x%02x,", g->v4[i]);
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printf("}\n");
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}
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#undef PRINT_IF_GUID(g,cmp)
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#endif
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static void get_guid(ByteIOContext *s, GUID *g)
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{
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int i;
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g->v1 = get_le32(s);
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g->v2 = get_le16(s);
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g->v3 = get_le16(s);
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for(i=0;i<8;i++)
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g->v4[i] = get_byte(s);
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}
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#if 0
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static void get_str16(ByteIOContext *pb, char *buf, int buf_size)
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{
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int len, c;
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char *q;
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len = get_le16(pb);
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q = buf;
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while (len > 0) {
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c = get_le16(pb);
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if ((q - buf) < buf_size - 1)
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*q++ = c;
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len--;
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}
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*q = '\0';
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}
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#endif
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static void get_str16_nolen(ByteIOContext *pb, int len, char *buf, int buf_size)
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{
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int c;
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char *q;
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q = buf;
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while (len > 0) {
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c = get_le16(pb);
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if ((q - buf) < buf_size - 1)
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*q++ = c;
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len-=2;
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}
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*q = '\0';
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}
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static int asf_probe(AVProbeData *pd)
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{
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GUID g;
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const unsigned char *p;
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int i;
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/* check file header */
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if (pd->buf_size <= 32)
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return 0;
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p = pd->buf;
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g.v1 = p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
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p += 4;
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g.v2 = p[0] | (p[1] << 8);
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p += 2;
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g.v3 = p[0] | (p[1] << 8);
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p += 2;
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for(i=0;i<8;i++)
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g.v4[i] = *p++;
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if (!memcmp(&g, &asf_header, sizeof(GUID)))
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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static int asf_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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ASFContext *asf = s->priv_data;
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GUID g;
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ByteIOContext *pb = &s->pb;
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AVStream *st;
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ASFStream *asf_st;
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int size, i;
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int64_t gsize;
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get_guid(pb, &g);
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if (memcmp(&g, &asf_header, sizeof(GUID)))
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goto fail;
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get_le64(pb);
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get_le32(pb);
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get_byte(pb);
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get_byte(pb);
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memset(&asf->asfid2avid, -1, sizeof(asf->asfid2avid));
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for(;;) {
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get_guid(pb, &g);
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gsize = get_le64(pb);
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#ifdef DEBUG
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printf("%08Lx: ", url_ftell(pb) - 24);
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print_guid(&g);
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printf(" size=0x%Lx\n", gsize);
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#endif
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if (gsize < 24)
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goto fail;
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if (!memcmp(&g, &file_header, sizeof(GUID))) {
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get_guid(pb, &asf->hdr.guid);
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asf->hdr.file_size = get_le64(pb);
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asf->hdr.create_time = get_le64(pb);
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asf->hdr.packets_count = get_le64(pb);
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asf->hdr.play_time = get_le64(pb);
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asf->hdr.send_time = get_le64(pb);
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asf->hdr.preroll = get_le32(pb);
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asf->hdr.ignore = get_le32(pb);
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asf->hdr.flags = get_le32(pb);
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asf->hdr.min_pktsize = get_le32(pb);
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asf->hdr.max_pktsize = get_le32(pb);
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asf->hdr.max_bitrate = get_le32(pb);
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asf->packet_size = asf->hdr.max_pktsize;
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asf->nb_packets = asf->hdr.packets_count;
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} else if (!memcmp(&g, &stream_header, sizeof(GUID))) {
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int type, total_size, type_specific_size, sizeX;
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unsigned int tag1;
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int64_t pos1, pos2;
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pos1 = url_ftell(pb);
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st = av_new_stream(s, 0);
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if (!st)
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goto fail;
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av_set_pts_info(st, 32, 1, 1000); /* 32 bit pts in ms */
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asf_st = av_mallocz(sizeof(ASFStream));
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if (!asf_st)
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goto fail;
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st->priv_data = asf_st;
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st->start_time = asf->hdr.preroll;
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st->duration = asf->hdr.send_time /
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(10000000 / 1000) - st->start_time;
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get_guid(pb, &g);
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if (!memcmp(&g, &audio_stream, sizeof(GUID))) {
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type = CODEC_TYPE_AUDIO;
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} else if (!memcmp(&g, &video_stream, sizeof(GUID))) {
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type = CODEC_TYPE_VIDEO;
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} else {
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goto fail;
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}
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get_guid(pb, &g);
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total_size = get_le64(pb);
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type_specific_size = get_le32(pb);
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get_le32(pb);
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st->id = get_le16(pb) & 0x7f; /* stream id */
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// mapping of asf ID to AV stream ID;
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asf->asfid2avid[st->id] = s->nb_streams - 1;
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get_le32(pb);
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st->codec.codec_type = type;
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if (type == CODEC_TYPE_AUDIO) {
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get_wav_header(pb, &st->codec, type_specific_size);
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st->need_parsing = 1;
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/* We have to init the frame size at some point .... */
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pos2 = url_ftell(pb);
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if (gsize > (pos2 + 8 - pos1 + 24)) {
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asf_st->ds_span = get_byte(pb);
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asf_st->ds_packet_size = get_le16(pb);
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asf_st->ds_chunk_size = get_le16(pb);
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asf_st->ds_data_size = get_le16(pb);
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asf_st->ds_silence_data = get_byte(pb);
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}
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//printf("Descrambling: ps:%d cs:%d ds:%d s:%d sd:%d\n",
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// asf_st->ds_packet_size, asf_st->ds_chunk_size,
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// asf_st->ds_data_size, asf_st->ds_span, asf_st->ds_silence_data);
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if (asf_st->ds_span > 1) {
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if (!asf_st->ds_chunk_size
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|| (asf_st->ds_packet_size/asf_st->ds_chunk_size <= 1))
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asf_st->ds_span = 0; // disable descrambling
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}
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switch (st->codec.codec_id) {
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case CODEC_ID_MP3:
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st->codec.frame_size = MPA_FRAME_SIZE;
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break;
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case CODEC_ID_PCM_S16LE:
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case CODEC_ID_PCM_S16BE:
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case CODEC_ID_PCM_U16LE:
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case CODEC_ID_PCM_U16BE:
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case CODEC_ID_PCM_S8:
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case CODEC_ID_PCM_U8:
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case CODEC_ID_PCM_ALAW:
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case CODEC_ID_PCM_MULAW:
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st->codec.frame_size = 1;
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break;
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default:
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/* This is probably wrong, but it prevents a crash later */
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st->codec.frame_size = 1;
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break;
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}
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} else {
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get_le32(pb);
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get_le32(pb);
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get_byte(pb);
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size = get_le16(pb); /* size */
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sizeX= get_le32(pb); /* size */
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st->codec.width = get_le32(pb);
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st->codec.height = get_le32(pb);
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/* not available for asf */
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get_le16(pb); /* panes */
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st->codec.bits_per_sample = get_le16(pb); /* depth */
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tag1 = get_le32(pb);
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url_fskip(pb, 20);
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// av_log(NULL, AV_LOG_DEBUG, "size:%d tsize:%d sizeX:%d\n", size, total_size, sizeX);
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size= sizeX;
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if (size > 40) {
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st->codec.extradata_size = size - 40;
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st->codec.extradata = av_mallocz(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
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get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
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}
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/* Extract palette from extradata if bpp <= 8 */
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/* This code assumes that extradata contains only palette */
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/* This is true for all paletted codecs implemented in ffmpeg */
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if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
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st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
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#ifdef WORDS_BIGENDIAN
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for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
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st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
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#else
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memcpy(st->codec.palctrl->palette, st->codec.extradata,
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FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
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#endif
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st->codec.palctrl->palette_changed = 1;
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}
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st->codec.codec_tag = tag1;
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st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
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if(tag1 == MKTAG('D', 'V', 'R', ' '))
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st->need_parsing = 1;
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}
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pos2 = url_ftell(pb);
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url_fskip(pb, gsize - (pos2 - pos1 + 24));
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} else if (!memcmp(&g, &data_header, sizeof(GUID))) {
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break;
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} else if (!memcmp(&g, &comment_header, sizeof(GUID))) {
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int len1, len2, len3, len4, len5;
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len1 = get_le16(pb);
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len2 = get_le16(pb);
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len3 = get_le16(pb);
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len4 = get_le16(pb);
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len5 = get_le16(pb);
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get_str16_nolen(pb, len1, s->title, sizeof(s->title));
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get_str16_nolen(pb, len2, s->author, sizeof(s->author));
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get_str16_nolen(pb, len3, s->copyright, sizeof(s->copyright));
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get_str16_nolen(pb, len4, s->comment, sizeof(s->comment));
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url_fskip(pb, len5);
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} else if (!memcmp(&g, &extended_content_header, sizeof(GUID))) {
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int desc_count, i;
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desc_count = get_le16(pb);
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for(i=0;i<desc_count;i++)
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{
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int name_len,value_type,value_len,value_num = 0;
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char *name, *value;
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name_len = get_le16(pb);
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name = (char *)av_mallocz(name_len);
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get_str16_nolen(pb, name_len, name, name_len);
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value_type = get_le16(pb);
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value_len = get_le16(pb);
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if ((value_type == 0) || (value_type == 1)) // unicode or byte
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{
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value = (char *)av_mallocz(value_len);
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get_str16_nolen(pb, value_len, value, value_len);
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if (strcmp(name,"WM/AlbumTitle")==0) { pstrcpy(s->album, sizeof(s->album), value); }
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av_free(value);
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}
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if ((value_type >= 2) || (value_type <= 5)) // boolean or DWORD or QWORD or WORD
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{
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if (value_type==2) value_num = get_le32(pb);
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if (value_type==3) value_num = get_le32(pb);
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if (value_type==4) value_num = get_le64(pb);
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if (value_type==5) value_num = get_le16(pb);
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if (strcmp(name,"WM/Track")==0) s->track = value_num + 1;
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if (strcmp(name,"WM/TrackNumber")==0) s->track = value_num;
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}
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av_free(name);
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}
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#if 0
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} else if (!memcmp(&g, &head1_guid, sizeof(GUID))) {
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int v1, v2;
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get_guid(pb, &g);
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v1 = get_le32(pb);
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v2 = get_le16(pb);
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} else if (!memcmp(&g, &codec_comment_header, sizeof(GUID))) {
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int len, v1, n, num;
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char str[256], *q;
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char tag[16];
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get_guid(pb, &g);
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print_guid(&g);
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n = get_le32(pb);
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for(i=0;i<n;i++) {
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num = get_le16(pb); /* stream number */
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get_str16(pb, str, sizeof(str));
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get_str16(pb, str, sizeof(str));
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len = get_le16(pb);
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q = tag;
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while (len > 0) {
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v1 = get_byte(pb);
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if ((q - tag) < sizeof(tag) - 1)
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*q++ = v1;
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len--;
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}
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*q = '\0';
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}
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#endif
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} else if (url_feof(pb)) {
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goto fail;
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} else {
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url_fseek(pb, gsize - 24, SEEK_CUR);
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}
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}
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get_guid(pb, &g);
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get_le64(pb);
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get_byte(pb);
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get_byte(pb);
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if (url_feof(pb))
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goto fail;
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asf->data_offset = url_ftell(pb);
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asf->packet_size_left = 0;
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return 0;
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fail:
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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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if (st) {
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av_free(st->priv_data);
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av_free(st->codec.extradata);
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}
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av_free(st);
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}
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return -1;
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}
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#define DO_2BITS(bits, var, defval) \
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switch (bits & 3) \
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{ \
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case 3: var = get_le32(pb); rsize += 4; break; \
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case 2: var = get_le16(pb); rsize += 2; break; \
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case 1: var = get_byte(pb); rsize++; break; \
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default: var = defval; break; \
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}
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static int asf_get_packet(AVFormatContext *s)
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{
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ASFContext *asf = s->priv_data;
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ByteIOContext *pb = &s->pb;
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uint32_t packet_length, padsize;
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int rsize = 9;
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int c;
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if((url_ftell(&s->pb) - s->data_offset) % asf->packet_size)
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return -1;
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assert((url_ftell(&s->pb) - s->data_offset) % asf->packet_size == 0);
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c = get_byte(pb);
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if (c != 0x82) {
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if (!url_feof(pb))
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av_log(s, AV_LOG_ERROR, "ff asf bad header %x at:%lld\n", c, url_ftell(pb));
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}
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if ((c & 0x0f) == 2) { // always true for now
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if (get_le16(pb) != 0) {
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if (!url_feof(pb))
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av_log(s, AV_LOG_ERROR, "ff asf bad non zero\n");
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return AVERROR_IO;
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}
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rsize+=2;
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/* }else{
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if (!url_feof(pb))
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printf("ff asf bad header %x at:%lld\n", c, url_ftell(pb));
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return AVERROR_IO;*/
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}
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asf->packet_flags = get_byte(pb);
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asf->packet_property = get_byte(pb);
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DO_2BITS(asf->packet_flags >> 5, packet_length, asf->packet_size);
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DO_2BITS(asf->packet_flags >> 1, padsize, 0); // sequence ignored
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DO_2BITS(asf->packet_flags >> 3, padsize, 0); // padding length
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asf->packet_timestamp = get_le32(pb);
|
|
get_le16(pb); /* duration */
|
|
// rsize has at least 11 bytes which have to be present
|
|
|
|
if (asf->packet_flags & 0x01) {
|
|
asf->packet_segsizetype = get_byte(pb); rsize++;
|
|
asf->packet_segments = asf->packet_segsizetype & 0x3f;
|
|
} else {
|
|
asf->packet_segments = 1;
|
|
asf->packet_segsizetype = 0x80;
|
|
}
|
|
asf->packet_size_left = packet_length - padsize - rsize;
|
|
if (packet_length < asf->hdr.min_pktsize)
|
|
padsize += asf->hdr.min_pktsize - packet_length;
|
|
asf->packet_padsize = padsize;
|
|
#ifdef DEBUG
|
|
printf("packet: size=%d padsize=%d left=%d\n", asf->packet_size, asf->packet_padsize, asf->packet_size_left);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
ASFContext *asf = s->priv_data;
|
|
ASFStream *asf_st = 0;
|
|
ByteIOContext *pb = &s->pb;
|
|
//static int pc = 0;
|
|
for (;;) {
|
|
int rsize = 0;
|
|
if (asf->packet_size_left < FRAME_HEADER_SIZE
|
|
|| asf->packet_segments < 1) {
|
|
//asf->packet_size_left <= asf->packet_padsize) {
|
|
int ret = asf->packet_size_left + asf->packet_padsize;
|
|
//printf("PacketLeftSize:%d Pad:%d Pos:%Ld\n", asf->packet_size_left, asf->packet_padsize, url_ftell(pb));
|
|
/* fail safe */
|
|
url_fskip(pb, ret);
|
|
asf->packet_pos= url_ftell(&s->pb);
|
|
ret = asf_get_packet(s);
|
|
//printf("READ ASF PACKET %d r:%d c:%d\n", ret, asf->packet_size_left, pc++);
|
|
if (ret < 0 || url_feof(pb))
|
|
return AVERROR_IO;
|
|
asf->packet_time_start = 0;
|
|
continue;
|
|
}
|
|
if (asf->packet_time_start == 0) {
|
|
/* read frame header */
|
|
int num = get_byte(pb);
|
|
asf->packet_segments--;
|
|
rsize++;
|
|
asf->packet_key_frame = (num & 0x80) >> 7;
|
|
asf->stream_index = asf->asfid2avid[num & 0x7f];
|
|
// sequence should be ignored!
|
|
DO_2BITS(asf->packet_property >> 4, asf->packet_seq, 0);
|
|
DO_2BITS(asf->packet_property >> 2, asf->packet_frag_offset, 0);
|
|
DO_2BITS(asf->packet_property, asf->packet_replic_size, 0);
|
|
//printf("key:%d stream:%d seq:%d offset:%d replic_size:%d\n", asf->packet_key_frame, asf->stream_index, asf->packet_seq, //asf->packet_frag_offset, asf->packet_replic_size);
|
|
if (asf->packet_replic_size > 1) {
|
|
assert(asf->packet_replic_size >= 8);
|
|
// it should be always at least 8 bytes - FIXME validate
|
|
asf->packet_obj_size = get_le32(pb);
|
|
asf->packet_frag_timestamp = get_le32(pb); // timestamp
|
|
if (asf->packet_replic_size > 8)
|
|
url_fskip(pb, asf->packet_replic_size - 8);
|
|
rsize += asf->packet_replic_size; // FIXME - check validity
|
|
} else if (asf->packet_replic_size==1){
|
|
// multipacket - frag_offset is begining timestamp
|
|
asf->packet_time_start = asf->packet_frag_offset;
|
|
asf->packet_frag_offset = 0;
|
|
asf->packet_frag_timestamp = asf->packet_timestamp;
|
|
|
|
asf->packet_time_delta = get_byte(pb);
|
|
rsize++;
|
|
}else{
|
|
assert(asf->packet_replic_size==0);
|
|
}
|
|
if (asf->packet_flags & 0x01) {
|
|
DO_2BITS(asf->packet_segsizetype >> 6, asf->packet_frag_size, 0); // 0 is illegal
|
|
#undef DO_2BITS
|
|
//printf("Fragsize %d\n", asf->packet_frag_size);
|
|
} else {
|
|
asf->packet_frag_size = asf->packet_size_left - rsize;
|
|
//printf("Using rest %d %d %d\n", asf->packet_frag_size, asf->packet_size_left, rsize);
|
|
}
|
|
if (asf->packet_replic_size == 1) {
|
|
asf->packet_multi_size = asf->packet_frag_size;
|
|
if (asf->packet_multi_size > asf->packet_size_left) {
|
|
asf->packet_segments = 0;
|
|
continue;
|
|
}
|
|
}
|
|
asf->packet_size_left -= rsize;
|
|
//printf("___objsize____ %d %d rs:%d\n", asf->packet_obj_size, asf->packet_frag_offset, rsize);
|
|
|
|
if (asf->stream_index < 0
|
|
|| s->streams[asf->stream_index]->discard >= AVDISCARD_ALL
|
|
|| (!asf->packet_key_frame && s->streams[asf->stream_index]->discard >= AVDISCARD_NONKEY)
|
|
) {
|
|
asf->packet_time_start = 0;
|
|
/* unhandled packet (should not happen) */
|
|
url_fskip(pb, asf->packet_frag_size);
|
|
asf->packet_size_left -= asf->packet_frag_size;
|
|
if(asf->stream_index < 0)
|
|
av_log(s, AV_LOG_ERROR, "ff asf skip %d %d\n", asf->packet_frag_size, num & 0x7f);
|
|
continue;
|
|
}
|
|
asf->asf_st = s->streams[asf->stream_index]->priv_data;
|
|
}
|
|
asf_st = asf->asf_st;
|
|
|
|
if ((asf->packet_frag_offset != asf_st->frag_offset
|
|
|| (asf->packet_frag_offset
|
|
&& asf->packet_seq != asf_st->seq)) // seq should be ignored
|
|
) {
|
|
/* cannot continue current packet: free it */
|
|
// FIXME better check if packet was already allocated
|
|
av_log(s, AV_LOG_INFO, "ff asf parser skips: %d - %d o:%d - %d %d %d fl:%d\n",
|
|
asf_st->pkt.size,
|
|
asf->packet_obj_size,
|
|
asf->packet_frag_offset, asf_st->frag_offset,
|
|
asf->packet_seq, asf_st->seq, asf->packet_frag_size);
|
|
if (asf_st->pkt.size)
|
|
av_free_packet(&asf_st->pkt);
|
|
asf_st->frag_offset = 0;
|
|
if (asf->packet_frag_offset != 0) {
|
|
url_fskip(pb, asf->packet_frag_size);
|
|
av_log(s, AV_LOG_INFO, "ff asf parser skipping %db\n", asf->packet_frag_size);
|
|
asf->packet_size_left -= asf->packet_frag_size;
|
|
continue;
|
|
}
|
|
}
|
|
if (asf->packet_replic_size == 1) {
|
|
// frag_offset is here used as the begining timestamp
|
|
asf->packet_frag_timestamp = asf->packet_time_start;
|
|
asf->packet_time_start += asf->packet_time_delta;
|
|
asf->packet_obj_size = asf->packet_frag_size = get_byte(pb);
|
|
asf->packet_size_left--;
|
|
asf->packet_multi_size--;
|
|
if (asf->packet_multi_size < asf->packet_obj_size)
|
|
{
|
|
asf->packet_time_start = 0;
|
|
url_fskip(pb, asf->packet_multi_size);
|
|
asf->packet_size_left -= asf->packet_multi_size;
|
|
continue;
|
|
}
|
|
asf->packet_multi_size -= asf->packet_obj_size;
|
|
//printf("COMPRESS size %d %d %d ms:%d\n", asf->packet_obj_size, asf->packet_frag_timestamp, asf->packet_size_left, asf->packet_multi_size);
|
|
}
|
|
if (asf_st->frag_offset == 0) {
|
|
/* new packet */
|
|
av_new_packet(&asf_st->pkt, asf->packet_obj_size);
|
|
asf_st->seq = asf->packet_seq;
|
|
asf_st->pkt.pts = asf->packet_frag_timestamp;
|
|
asf_st->pkt.stream_index = asf->stream_index;
|
|
asf_st->packet_pos= asf->packet_pos;
|
|
//printf("new packet: stream:%d key:%d packet_key:%d audio:%d size:%d\n",
|
|
//asf->stream_index, asf->packet_key_frame, asf_st->pkt.flags & PKT_FLAG_KEY,
|
|
//s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO, asf->packet_obj_size);
|
|
if (s->streams[asf->stream_index]->codec.codec_type == CODEC_TYPE_AUDIO)
|
|
asf->packet_key_frame = 1;
|
|
if (asf->packet_key_frame)
|
|
asf_st->pkt.flags |= PKT_FLAG_KEY;
|
|
}
|
|
|
|
/* read data */
|
|
//printf("READ PACKET s:%d os:%d o:%d,%d l:%d DATA:%p\n",
|
|
// asf->packet_size, asf_st->pkt.size, asf->packet_frag_offset,
|
|
// asf_st->frag_offset, asf->packet_frag_size, asf_st->pkt.data);
|
|
asf->packet_size_left -= asf->packet_frag_size;
|
|
if (asf->packet_size_left < 0)
|
|
continue;
|
|
get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
|
|
asf->packet_frag_size);
|
|
asf_st->frag_offset += asf->packet_frag_size;
|
|
/* test if whole packet is read */
|
|
if (asf_st->frag_offset == asf_st->pkt.size) {
|
|
/* return packet */
|
|
if (asf_st->ds_span > 1) {
|
|
/* packet descrambling */
|
|
char* newdata = av_malloc(asf_st->pkt.size);
|
|
if (newdata) {
|
|
int offset = 0;
|
|
while (offset < asf_st->pkt.size) {
|
|
int off = offset / asf_st->ds_chunk_size;
|
|
int row = off / asf_st->ds_span;
|
|
int col = off % asf_st->ds_span;
|
|
int idx = row + col * asf_st->ds_packet_size / asf_st->ds_chunk_size;
|
|
//printf("off:%d row:%d col:%d idx:%d\n", off, row, col, idx);
|
|
memcpy(newdata + offset,
|
|
asf_st->pkt.data + idx * asf_st->ds_chunk_size,
|
|
asf_st->ds_chunk_size);
|
|
offset += asf_st->ds_chunk_size;
|
|
}
|
|
av_free(asf_st->pkt.data);
|
|
asf_st->pkt.data = newdata;
|
|
}
|
|
}
|
|
asf_st->frag_offset = 0;
|
|
memcpy(pkt, &asf_st->pkt, sizeof(AVPacket));
|
|
//printf("packet %d %d\n", asf_st->pkt.size, asf->packet_frag_size);
|
|
asf_st->pkt.size = 0;
|
|
asf_st->pkt.data = 0;
|
|
break; // packet completed
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int asf_read_close(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
AVStream *st = s->streams[i];
|
|
av_free(st->priv_data);
|
|
av_free(st->codec.extradata);
|
|
av_free(st->codec.palctrl);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
// Added to support seeking after packets have been read
|
|
// If information is not reset, read_packet fails due to
|
|
// leftover information from previous reads
|
|
static void asf_reset_header(AVFormatContext *s)
|
|
{
|
|
ASFContext *asf = s->priv_data;
|
|
ASFStream *asf_st;
|
|
int i;
|
|
|
|
asf->packet_nb_frames = 0;
|
|
asf->packet_timestamp_start = -1;
|
|
asf->packet_timestamp_end = -1;
|
|
asf->packet_size_left = 0;
|
|
asf->packet_segments = 0;
|
|
asf->packet_flags = 0;
|
|
asf->packet_property = 0;
|
|
asf->packet_timestamp = 0;
|
|
asf->packet_segsizetype = 0;
|
|
asf->packet_segments = 0;
|
|
asf->packet_seq = 0;
|
|
asf->packet_replic_size = 0;
|
|
asf->packet_key_frame = 0;
|
|
asf->packet_padsize = 0;
|
|
asf->packet_frag_offset = 0;
|
|
asf->packet_frag_size = 0;
|
|
asf->packet_frag_timestamp = 0;
|
|
asf->packet_multi_size = 0;
|
|
asf->packet_obj_size = 0;
|
|
asf->packet_time_delta = 0;
|
|
asf->packet_time_start = 0;
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
asf_st= s->streams[i]->priv_data;
|
|
av_free_packet(&asf_st->pkt);
|
|
asf_st->frag_offset=0;
|
|
asf_st->seq=0;
|
|
}
|
|
asf->asf_st= NULL;
|
|
}
|
|
|
|
static int64_t asf_read_pts(AVFormatContext *s, int stream_index, int64_t *ppos, int64_t pos_limit)
|
|
{
|
|
ASFContext *asf = s->priv_data;
|
|
AVPacket pkt1, *pkt = &pkt1;
|
|
ASFStream *asf_st;
|
|
int64_t pts;
|
|
int64_t pos= *ppos;
|
|
int i;
|
|
int64_t start_pos[s->nb_streams];
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
start_pos[i]= pos;
|
|
}
|
|
|
|
pos= (pos+asf->packet_size-1-s->data_offset)/asf->packet_size*asf->packet_size+ s->data_offset;
|
|
*ppos= pos;
|
|
url_fseek(&s->pb, pos, SEEK_SET);
|
|
|
|
//printf("asf_read_pts\n");
|
|
asf_reset_header(s);
|
|
for(;;){
|
|
if (av_read_frame(s, pkt) < 0){
|
|
av_log(s, AV_LOG_INFO, "seek failed\n");
|
|
return AV_NOPTS_VALUE;
|
|
}
|
|
|
|
pts= pkt->pts * 1000 / AV_TIME_BASE;
|
|
|
|
av_free_packet(pkt);
|
|
if(pkt->flags&PKT_FLAG_KEY){
|
|
i= pkt->stream_index;
|
|
|
|
asf_st= s->streams[i]->priv_data;
|
|
|
|
assert((asf_st->packet_pos - s->data_offset) % asf->packet_size == 0);
|
|
pos= asf_st->packet_pos;
|
|
|
|
av_add_index_entry(s->streams[i], pos, pts, pos - start_pos[i] + 1, AVINDEX_KEYFRAME);
|
|
start_pos[i]= asf_st->packet_pos + 1;
|
|
|
|
if(pkt->stream_index == stream_index)
|
|
break;
|
|
}
|
|
}
|
|
|
|
*ppos= pos;
|
|
//printf("found keyframe at %Ld stream %d stamp:%Ld\n", *ppos, stream_index, pts);
|
|
|
|
return pts;
|
|
}
|
|
|
|
static int asf_read_seek(AVFormatContext *s, int stream_index, int64_t pts, int flags)
|
|
{
|
|
ASFContext *asf = s->priv_data;
|
|
|
|
if (asf->packet_size <= 0)
|
|
return -1;
|
|
|
|
if(av_seek_frame_binary(s, stream_index, pts, flags)<0)
|
|
return -1;
|
|
|
|
asf_reset_header(s);
|
|
return 0;
|
|
}
|
|
|
|
static AVInputFormat asf_iformat = {
|
|
"asf",
|
|
"asf format",
|
|
sizeof(ASFContext),
|
|
asf_probe,
|
|
asf_read_header,
|
|
asf_read_packet,
|
|
asf_read_close,
|
|
asf_read_seek,
|
|
asf_read_pts,
|
|
};
|
|
|
|
#ifdef CONFIG_ENCODERS
|
|
extern AVOutputFormat asf_oformat;
|
|
extern AVOutputFormat asf_stream_oformat;
|
|
#endif //CONFIG_ENCODERS
|
|
|
|
int asf_init(void)
|
|
{
|
|
av_register_input_format(&asf_iformat);
|
|
#ifdef CONFIG_ENCODERS
|
|
av_register_output_format(&asf_oformat);
|
|
av_register_output_format(&asf_stream_oformat);
|
|
#endif //CONFIG_ENCODERS
|
|
return 0;
|
|
}
|