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FFmpeg/libavformat/swfdec.c

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/*
* 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 "config.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif
#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/get_bits.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 (avio_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)
{
GetBitContext gb;
int len, xmin, xmax, ymin, ymax;
if(p->buf_size < 15)
return 0;
/* check file header */
if ( AV_RB24(p->buf) != AV_RB24("CWS")
&& AV_RB24(p->buf) != AV_RB24("FWS"))
return 0;
if ( AV_RB24(p->buf) == AV_RB24("CWS")
&& p->buf[3] <= 20)
return AVPROBE_SCORE_MAX / 4 + 1;
if (init_get_bits8(&gb, p->buf + 3, p->buf_size - 3) < 0)
return 0;
skip_bits(&gb, 40);
len = get_bits(&gb, 5);
if (!len)
return 0;
xmin = get_bits_long(&gb, len);
xmax = get_bits_long(&gb, len);
ymin = get_bits_long(&gb, len);
ymax = get_bits_long(&gb, len);
if (xmin || ymin || !xmax || !ymax)
return 0;
if (p->buf[3] >= 20 || xmax < 16 || ymax < 16)
return AVPROBE_SCORE_MAX / 4;
return AVPROBE_SCORE_EXTENSION + 1;
}
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#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)
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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 == Z_STREAM_END)
return AVERROR_EOF;
if (ret != Z_OK)
return AVERROR(EINVAL);
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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;
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avio_rl32(pb);
if (tag == MKBETAG('C', 'W', 'S', 0)) {
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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);
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#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 AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info)
{
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int sample_rate_code, sample_size_code;
AVStream *ast = avformat_new_stream(s, NULL);
if (!ast)
return NULL;
ast->id = id;
if (info & 1) {
ast->codecpar->channels = 2;
ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
ast->codecpar->channels = 1;
ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
}
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
ast->need_parsing = AVSTREAM_PARSE_FULL;
sample_rate_code = info>>2 & 3;
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sample_size_code = info>>1 & 1;
if (!sample_size_code && ast->codecpar->codec_id == AV_CODEC_ID_PCM_S16LE)
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
ast->codecpar->sample_rate = 44100 >> (3 - sample_rate_code);
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
return ast;
}
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;
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#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 (len < 0) {
av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len);
return AVERROR_INVALIDDATA;
}
if (tag == TAG_VIDEOSTREAM) {
int ch_id = avio_rl16(pb);
len -= 2;
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i];
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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if (st->codecpar->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 AVERROR(ENOMEM);
vst->id = ch_id;
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->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 */
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i];
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
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if (st->codecpar->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 = create_new_audio_stream(s, -1, v); /* -1 to avoid clash with video stream ch_id */
if (!ast)
return AVERROR(ENOMEM);
len -= 4;
} else if (tag == TAG_DEFINESOUND) {
/* audio stream */
int ch_id = avio_rl16(pb);
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i];
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == ch_id)
goto skip;
}
// FIXME: The entire audio stream is stored in a single chunk/tag. Normally,
// these are smaller audio streams in DEFINESOUND tags, but it's technically
// possible they could be huge. Break it up into multiple packets if it's big.
v = avio_r8(pb);
ast = create_new_audio_stream(s, ch_id, v);
if (!ast)
return AVERROR(ENOMEM);
ast->duration = avio_rl32(pb); // number of samples
if (((v>>4) & 15) == 2) { // MP3 sound data record
ast->skip_samples = avio_rl16(pb);
len -= 2;
}
len -= 7;
if ((res = av_get_packet(pb, pkt, len)) < 0)
return res;
pkt->pos = pos;
pkt->stream_index = ast->index;
return pkt->size;
} 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];
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
frame = avio_rl16(pb);
len -= 2;
if (len <= 0)
goto skip;
if ((res = av_get_packet(pb, pkt, len)) < 0)
return res;
pkt->pos = pos;
pkt->pts = frame;
pkt->stream_index = st->index;
return pkt->size;
}
}
} else if (tag == TAG_DEFINEBITSLOSSLESS || tag == TAG_DEFINEBITSLOSSLESS2) {
#if CONFIG_ZLIB
long out_len;
uint8_t *buf = NULL, *zbuf = NULL, *pal;
uint32_t colormap[AVPALETTE_COUNT] = {0};
const int alpha_bmp = tag == TAG_DEFINEBITSLOSSLESS2;
const int colormapbpp = 3 + alpha_bmp;
int linesize, colormapsize = 0;
const int ch_id = avio_rl16(pb);
const int bmp_fmt = avio_r8(pb);
const int width = avio_rl16(pb);
const int height = avio_rl16(pb);
int pix_fmt;
len -= 2+1+2+2;
switch (bmp_fmt) {
case 3: // PAL-8
linesize = width;
colormapsize = avio_r8(pb) + 1;
len--;
break;
case 4: // RGB15
linesize = width * 2;
break;
case 5: // RGB24 (0RGB)
linesize = width * 4;
break;
default:
av_log(s, AV_LOG_ERROR, "invalid bitmap format %d, skipped\n", bmp_fmt);
goto bitmap_end_skip;
}
linesize = FFALIGN(linesize, 4);
if (av_image_check_size(width, height, 0, s) < 0 ||
linesize >= INT_MAX / height ||
linesize * height >= INT_MAX - colormapsize * colormapbpp) {
av_log(s, AV_LOG_ERROR, "invalid frame size %dx%d\n", width, height);
goto bitmap_end_skip;
}
out_len = colormapsize * colormapbpp + linesize * height;
ff_dlog(s, "bitmap: ch=%d fmt=%d %dx%d (linesize=%d) len=%d->%ld pal=%d\n",
ch_id, bmp_fmt, width, height, linesize, len, out_len, colormapsize);
zbuf = av_malloc(len);
buf = av_malloc(out_len);
if (!zbuf || !buf) {
res = AVERROR(ENOMEM);
goto bitmap_end;
}
len = avio_read(pb, zbuf, len);
if (len < 0 || (res = uncompress(buf, &out_len, zbuf, len)) != Z_OK) {
av_log(s, AV_LOG_WARNING, "Failed to uncompress one bitmap\n");
goto bitmap_end_skip;
}
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
if (st->codecpar->codec_id == AV_CODEC_ID_RAWVIDEO && st->id == -3)
break;
}
if (i == s->nb_streams) {
vst = avformat_new_stream(s, NULL);
if (!vst) {
res = AVERROR(ENOMEM);
goto bitmap_end;
}
vst->id = -3; /* -3 to avoid clash with video stream and audio stream */
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_RAWVIDEO;
avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
st = vst;
}
if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0)
goto bitmap_end;
if (!st->codecpar->width && !st->codecpar->height) {
st->codecpar->width = width;
st->codecpar->height = height;
} else {
ff_add_param_change(pkt, 0, 0, 0, width, height);
}
pkt->pos = pos;
pkt->stream_index = st->index;
if (linesize * height > pkt->size) {
res = AVERROR_INVALIDDATA;
av_packet_unref(pkt);
goto bitmap_end;
}
switch (bmp_fmt) {
case 3:
pix_fmt = AV_PIX_FMT_PAL8;
for (i = 0; i < colormapsize; i++)
if (alpha_bmp) colormap[i] = buf[3]<<24 | AV_RB24(buf + 4*i);
else colormap[i] = 0xffU <<24 | AV_RB24(buf + 3*i);
pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE);
if (!pal) {
res = AVERROR(ENOMEM);
goto bitmap_end;
}
memcpy(pal, colormap, AVPALETTE_SIZE);
break;
case 4:
pix_fmt = AV_PIX_FMT_RGB555;
break;
case 5:
pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB;
break;
default:
av_assert0(0);
}
if (st->codecpar->format != AV_PIX_FMT_NONE && st->codecpar->format != pix_fmt) {
av_log(s, AV_LOG_ERROR, "pixel format change unsupported\n");
} else
st->codecpar->format = pix_fmt;
memcpy(pkt->data, buf + colormapsize*colormapbpp, linesize * height);
res = pkt->size;
bitmap_end:
av_freep(&zbuf);
av_freep(&buf);
return res;
bitmap_end_skip:
av_freep(&zbuf);
av_freep(&buf);
#else
av_log(s, AV_LOG_ERROR, "this file requires zlib support compiled in\n");
#endif
} else if (tag == TAG_STREAMBLOCK) {
for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i];
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
if (st->codecpar->codec_id == AV_CODEC_ID_MP3) {
2012-12-10 20:48:18 +03:00
avio_skip(pb, 4);
len -= 4;
if (len <= 0)
goto skip;
if ((res = av_get_packet(pb, pkt, len)) < 0)
return res;
} else { // ADPCM, PCM
if (len <= 0)
goto skip;
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];
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
if (st->codecpar->codec_id == AV_CODEC_ID_MJPEG && st->id == -2)
break;
}
if (i == s->nb_streams) {
vst = avformat_new_stream(s, NULL);
if (!vst)
return AVERROR(ENOMEM);
vst->id = -2; /* -2 to avoid clash with video stream and audio stream */
lavf: replace AVStream.codec with AVStream.codecpar Currently, AVStream contains an embedded AVCodecContext instance, which is used by demuxers to export stream parameters to the caller and by muxers to receive stream parameters from the caller. It is also used internally as the codec context that is passed to parsers. In addition, it is also widely used by the callers as the decoding (when demuxer) or encoding (when muxing) context, though this has been officially discouraged since Libav 11. There are multiple important problems with this approach: - the fields in AVCodecContext are in general one of * stream parameters * codec options * codec state However, it's not clear which ones are which. It is consequently unclear which fields are a demuxer allowed to set or a muxer allowed to read. This leads to erratic behaviour depending on whether decoding or encoding is being performed or not (and whether it uses the AVStream embedded codec context). - various synchronization issues arising from the fact that the same context is used by several different APIs (muxers/demuxers, parsers, bitstream filters and encoders/decoders) simultaneously, with there being no clear rules for who can modify what and the different processes being typically delayed with respect to each other. - avformat_find_stream_info() making it necessary to support opening and closing a single codec context multiple times, thus complicating the semantics of freeing various allocated objects in the codec context. Those problems are resolved by replacing the AVStream embedded codec context with a newly added AVCodecParameters instance, which stores only the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 21:42:52 +03:00
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_MJPEG;
avpriv_set_pts_info(vst, 64, 256, swf->frame_rate);
st = vst;
}
avio_rl16(pb); /* BITMAP_ID */
len -= 2;
if (len < 4)
goto skip;
if ((res = av_new_packet(pkt, len)) < 0)
return res;
if (avio_read(pb, pkt->data, 4) != 4) {
av_packet_unref(pkt);
return AVERROR_INVALIDDATA;
}
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;
memset(pkt->data+pkt->size, 0, 4);
res = avio_read(pb, pkt->data, pkt->size);
} else {
res = avio_read(pb, pkt->data + 4, pkt->size - 4);
if (res >= 0)
res += 4;
}
if (res != pkt->size) {
if (res < 0) {
av_packet_unref(pkt);
return res;
}
av_shrink_packet(pkt, res);
}
pkt->pos = pos;
pkt->stream_index = st->index;
return pkt->size;
} else {
av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag);
}
skip:
if(len<0)
av_log(s, AV_LOG_WARNING, "Clipping len %d\n", len);
len = FFMAX(0, len);
avio_skip(pb, len);
}
}
2012-04-03 02:33:03 +03:00
#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);
avio_context_free(&s->zpb);
2012-04-03 02:33:03 +03:00
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,
2012-04-03 02:33:03 +03:00
#if CONFIG_ZLIB
.read_close = swf_read_close,
#endif
};