third_party_ffmpeg/libavformat/swfdec.c
Stefano Sabatini 72415b2adb Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk
2010-03-30 23:30:55 +00:00

218 lines
7.1 KiB
C

/*
* Flash Compatible Streaming Format demuxer
* Copyright (c) 2000 Fabrice Bellard
* Copyright (c) 2003 Tinic Uro
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intreadwrite.h"
#include "swf.h"
static int get_swf_tag(ByteIOContext *pb, int *len_ptr)
{
int tag, len;
if (url_feof(pb))
return -1;
tag = get_le16(pb);
len = tag & 0x3f;
tag = tag >> 6;
if (len == 0x3f) {
len = get_le32(pb);
}
// av_log(NULL, AV_LOG_DEBUG, "Tag: %d - Len: %d\n", tag, len);
*len_ptr = len;
return tag;
}
static int swf_probe(AVProbeData *p)
{
/* check file header */
if ((p->buf[0] == 'F' || p->buf[0] == 'C') && p->buf[1] == 'W' &&
p->buf[2] == 'S')
return AVPROBE_SCORE_MAX;
else
return 0;
}
static int swf_read_header(AVFormatContext *s, AVFormatParameters *ap)
{
SWFContext *swf = s->priv_data;
ByteIOContext *pb = s->pb;
int nbits, len, tag;
tag = get_be32(pb) & 0xffffff00;
if (tag == MKBETAG('C', 'W', 'S', 0)) {
av_log(s, AV_LOG_ERROR, "Compressed SWF format not supported\n");
return AVERROR(EIO);
}
if (tag != MKBETAG('F', 'W', 'S', 0))
return AVERROR(EIO);
get_le32(pb);
/* skip rectangle size */
nbits = get_byte(pb) >> 3;
len = (4 * nbits - 3 + 7) / 8;
url_fskip(pb, len);
swf->frame_rate = get_le16(pb); /* 8.8 fixed */
get_le16(pb); /* frame count */
swf->samples_per_frame = 0;
s->ctx_flags |= AVFMTCTX_NOHEADER;
return 0;
}
static int swf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
SWFContext *swf = s->priv_data;
ByteIOContext *pb = s->pb;
AVStream *vst = NULL, *ast = NULL, *st = 0;
int tag, len, i, frame, v;
for(;;) {
uint64_t pos = url_ftell(pb);
tag = get_swf_tag(pb, &len);
if (tag < 0)
return AVERROR(EIO);
if (tag == TAG_VIDEOSTREAM) {
int ch_id = get_le16(pb);
len -= 2;
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i];
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id)
goto skip;
}
get_le16(pb);
get_le16(pb);
get_le16(pb);
get_byte(pb);
/* Check for FLV1 */
vst = av_new_stream(s, ch_id);
if (!vst)
return -1;
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codec->codec_id = ff_codec_get_id(swf_codec_tags, get_byte(pb));
av_set_pts_info(vst, 16, 256, swf->frame_rate);
vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
len -= 8;
} else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) {
/* streaming found */
int sample_rate_code;
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i];
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1)
goto skip;
}
get_byte(pb);
v = get_byte(pb);
swf->samples_per_frame = get_le16(pb);
ast = av_new_stream(s, -1); /* -1 to avoid clash with video stream ch_id */
if (!ast)
return -1;
ast->codec->channels = 1 + (v&1);
ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15);
ast->need_parsing = AVSTREAM_PARSE_FULL;
sample_rate_code= (v>>2) & 3;
if (!sample_rate_code)
return AVERROR(EIO);
ast->codec->sample_rate = 11025 << (sample_rate_code-1);
av_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
len -= 4;
} else if (tag == TAG_VIDEOFRAME) {
int ch_id = get_le16(pb);
len -= 2;
for(i=0; i<s->nb_streams; i++) {
st = s->streams[i];
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
frame = get_le16(pb);
av_get_packet(pb, pkt, len-2);
pkt->pos = pos;
pkt->pts = frame;
pkt->stream_index = st->index;
return pkt->size;
}
}
} else if (tag == TAG_STREAMBLOCK) {
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
if (st->codec->codec_id == CODEC_ID_MP3) {
url_fskip(pb, 4);
av_get_packet(pb, pkt, len-4);
} else { // ADPCM, PCM
av_get_packet(pb, pkt, len);
}
pkt->pos = pos;
pkt->stream_index = st->index;
return pkt->size;
}
}
} else if (tag == TAG_JPEG2) {
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i];
if (st->codec->codec_id == CODEC_ID_MJPEG && st->id == -2)
break;
}
if (i == s->nb_streams) {
vst = av_new_stream(s, -2); /* -2 to avoid clash with video stream and audio stream */
if (!vst)
return -1;
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codec->codec_id = CODEC_ID_MJPEG;
av_set_pts_info(vst, 64, 256, swf->frame_rate);
vst->codec->time_base = (AVRational){ 256, swf->frame_rate };
st = vst;
}
get_le16(pb); /* BITMAP_ID */
av_new_packet(pkt, len-2);
get_buffer(pb, pkt->data, 4);
if (AV_RB32(pkt->data) == 0xffd8ffd9 ||
AV_RB32(pkt->data) == 0xffd9ffd8) {
/* old SWF files containing SOI/EOI as data start */
/* files created by swink have reversed tag */
pkt->size -= 4;
get_buffer(pb, pkt->data, pkt->size);
} else {
get_buffer(pb, pkt->data + 4, pkt->size - 4);
}
pkt->pos = pos;
pkt->stream_index = st->index;
return pkt->size;
}
skip:
url_fskip(pb, len);
}
return 0;
}
AVInputFormat swf_demuxer = {
"swf",
NULL_IF_CONFIG_SMALL("Flash format"),
sizeof(SWFContext),
swf_probe,
swf_read_header,
swf_read_packet,
};