mirror of https://git.ffmpeg.org/ffmpeg.git
296 lines
9.2 KiB
C
296 lines
9.2 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 const AVCodecTag swf_audio_codec_tags[] = {
|
|
{ AV_CODEC_ID_PCM_S16LE, 0x00 },
|
|
{ AV_CODEC_ID_ADPCM_SWF, 0x01 },
|
|
{ AV_CODEC_ID_MP3, 0x02 },
|
|
{ AV_CODEC_ID_PCM_S16LE, 0x03 },
|
|
// { AV_CODEC_ID_NELLYMOSER, 0x06 },
|
|
{ AV_CODEC_ID_NONE, 0 },
|
|
};
|
|
|
|
static int get_swf_tag(AVIOContext *pb, int *len_ptr)
|
|
{
|
|
int tag, len;
|
|
|
|
if (url_feof(pb))
|
|
return AVERROR_EOF;
|
|
|
|
tag = avio_rl16(pb);
|
|
len = tag & 0x3f;
|
|
tag = tag >> 6;
|
|
if (len == 0x3f) {
|
|
len = avio_rl32(pb);
|
|
}
|
|
*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;
|
|
}
|
|
|
|
#if CONFIG_ZLIB
|
|
static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
|
|
{
|
|
AVFormatContext *s = opaque;
|
|
SWFContext *swf = s->priv_data;
|
|
z_stream *z = &swf->zstream;
|
|
int ret;
|
|
|
|
retry:
|
|
if (!z->avail_in) {
|
|
int n = avio_read(s->pb, swf->zbuf_in, ZBUF_SIZE);
|
|
if (n <= 0)
|
|
return n;
|
|
z->next_in = swf->zbuf_in;
|
|
z->avail_in = n;
|
|
}
|
|
|
|
z->next_out = buf;
|
|
z->avail_out = buf_size;
|
|
|
|
ret = inflate(z, Z_NO_FLUSH);
|
|
if (ret < 0)
|
|
return AVERROR(EINVAL);
|
|
if (ret == Z_STREAM_END)
|
|
return AVERROR_EOF;
|
|
|
|
if (buf_size - z->avail_out == 0)
|
|
goto retry;
|
|
|
|
return buf_size - z->avail_out;
|
|
}
|
|
#endif
|
|
|
|
static int swf_read_header(AVFormatContext *s)
|
|
{
|
|
SWFContext *swf = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
int nbits, len, tag;
|
|
|
|
tag = avio_rb32(pb) & 0xffffff00;
|
|
avio_rl32(pb);
|
|
|
|
if (tag == MKBETAG('C', 'W', 'S', 0)) {
|
|
av_log(s, AV_LOG_INFO, "SWF compressed file detected\n");
|
|
#if CONFIG_ZLIB
|
|
swf->zbuf_in = av_malloc(ZBUF_SIZE);
|
|
swf->zbuf_out = av_malloc(ZBUF_SIZE);
|
|
swf->zpb = avio_alloc_context(swf->zbuf_out, ZBUF_SIZE, 0, s,
|
|
zlib_refill, NULL, NULL);
|
|
if (!swf->zbuf_in || !swf->zbuf_out || !swf->zpb)
|
|
return AVERROR(ENOMEM);
|
|
swf->zpb->seekable = 0;
|
|
if (inflateInit(&swf->zstream) != Z_OK) {
|
|
av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
pb = swf->zpb;
|
|
#else
|
|
av_log(s, AV_LOG_ERROR, "zlib support is required to read SWF compressed files\n");
|
|
return AVERROR(EIO);
|
|
#endif
|
|
} else if (tag != MKBETAG('F', 'W', 'S', 0))
|
|
return AVERROR(EIO);
|
|
/* skip rectangle size */
|
|
nbits = avio_r8(pb) >> 3;
|
|
len = (4 * nbits - 3 + 7) / 8;
|
|
avio_skip(pb, len);
|
|
swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
|
|
avio_rl16(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;
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *vst = NULL, *ast = NULL, *st = 0;
|
|
int tag, len, i, frame, v, res;
|
|
|
|
#if CONFIG_ZLIB
|
|
if (swf->zpb)
|
|
pb = swf->zpb;
|
|
#endif
|
|
|
|
for(;;) {
|
|
uint64_t pos = avio_tell(pb);
|
|
tag = get_swf_tag(pb, &len);
|
|
if (tag < 0)
|
|
return tag;
|
|
if (tag == TAG_VIDEOSTREAM) {
|
|
int ch_id = avio_rl16(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;
|
|
}
|
|
|
|
avio_rl16(pb);
|
|
avio_rl16(pb);
|
|
avio_rl16(pb);
|
|
avio_r8(pb);
|
|
/* Check for FLV1 */
|
|
vst = avformat_new_stream(s, NULL);
|
|
if (!vst)
|
|
return -1;
|
|
vst->id = ch_id;
|
|
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb));
|
|
avpriv_set_pts_info(vst, 16, 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;
|
|
}
|
|
|
|
avio_r8(pb);
|
|
v = avio_r8(pb);
|
|
swf->samples_per_frame = avio_rl16(pb);
|
|
ast = avformat_new_stream(s, NULL);
|
|
if (!ast)
|
|
return -1;
|
|
ast->id = -1; /* -1 to avoid clash with video stream ch_id */
|
|
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;
|
|
ast->codec->sample_rate = 44100 >> (3 - sample_rate_code);
|
|
avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
|
|
len -= 4;
|
|
} else if (tag == TAG_VIDEOFRAME) {
|
|
int ch_id = avio_rl16(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 = avio_rl16(pb);
|
|
if ((res = av_get_packet(pb, pkt, len-2)) < 0)
|
|
return res;
|
|
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 == AV_CODEC_ID_MP3) {
|
|
avio_skip(pb, 4);
|
|
if ((res = av_get_packet(pb, pkt, len-4)) < 0)
|
|
return res;
|
|
} else { // ADPCM, PCM
|
|
if ((res = av_get_packet(pb, pkt, len)) < 0)
|
|
return res;
|
|
}
|
|
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 == AV_CODEC_ID_MJPEG && st->id == -2)
|
|
break;
|
|
}
|
|
if (i == s->nb_streams) {
|
|
vst = avformat_new_stream(s, NULL);
|
|
if (!vst)
|
|
return -1;
|
|
vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
|
|
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
vst->codec->codec_id = AV_CODEC_ID_MJPEG;
|
|
avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
|
|
st = vst;
|
|
}
|
|
avio_rl16(pb); /* BITMAP_ID */
|
|
if ((res = av_new_packet(pkt, len-2)) < 0)
|
|
return res;
|
|
avio_read(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;
|
|
avio_read(pb, pkt->data, pkt->size);
|
|
} else {
|
|
avio_read(pb, pkt->data + 4, pkt->size - 4);
|
|
}
|
|
pkt->pos = pos;
|
|
pkt->stream_index = st->index;
|
|
return pkt->size;
|
|
}
|
|
skip:
|
|
avio_skip(pb, len);
|
|
}
|
|
}
|
|
|
|
#if CONFIG_ZLIB
|
|
static av_cold int swf_read_close(AVFormatContext *avctx)
|
|
{
|
|
SWFContext *s = avctx->priv_data;
|
|
inflateEnd(&s->zstream);
|
|
av_freep(&s->zbuf_in);
|
|
av_freep(&s->zbuf_out);
|
|
av_freep(&s->zpb);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
AVInputFormat ff_swf_demuxer = {
|
|
.name = "swf",
|
|
.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
|
|
.priv_data_size = sizeof(SWFContext),
|
|
.read_probe = swf_probe,
|
|
.read_header = swf_read_header,
|
|
.read_packet = swf_read_packet,
|
|
#if CONFIG_ZLIB
|
|
.read_close = swf_read_close,
|
|
#endif
|
|
};
|