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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 Libav.
*
* Libav 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.
*
* Libav 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 Libav; 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/channel_layout.h"
#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 (pb->eof_reached)
return -1;
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 != Z_OK && ret != Z_STREAM_END) {
av_log(s, AV_LOG_ERROR, "Inflate error: %d\n", ret);
return AVERROR_UNKNOWN;
}
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, "Compressed SWF file detected\n");
#if CONFIG_ZLIB
if (inflateInit(&swf->zstream) != Z_OK) {
av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
return AVERROR(EINVAL);
}
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) {
av_freep(&swf->zbuf_in);
av_freep(&swf->zbuf_out);
av_freep(&swf->zpb);
return AVERROR(ENOMEM);
}
swf->zpb->seekable = 0;
pb = swf->zpb;
#else
av_log(s, AV_LOG_ERROR, "missing zlib support, unable to open\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 AVERROR(EIO);
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];
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 */
if (v & 1) {
ast->codec->channels = 2;
ast->codec->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
ast->codec->channels = 1;
ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
}
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);
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_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);
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];
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 */
len -= 2;
if (len < 4)
goto skip;
if ((res = av_new_packet(pkt, len)) < 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:
len = FFMAX(0, len);
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
};
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