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/* |
376aefdd |
* Flash Compatible Streaming Format demuxer |
406792e7 |
* Copyright (c) 2000 Fabrice Bellard
* Copyright (c) 2003 Tinic Uro |
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*
* 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
*/
|
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#include "libavutil/intreadwrite.h" |
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#include "swf.h"
|
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static const AVCodecTag swf_audio_codec_tags[] = { |
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{ 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 }, |
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};
|
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static int get_swf_tag(AVIOContext *pb, int *len_ptr) |
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{
int tag, len;
if (url_feof(pb)) |
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return AVERROR_EOF; |
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|
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tag = avio_rl16(pb); |
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len = tag & 0x3f;
tag = tag >> 6;
if (len == 0x3f) { |
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len = avio_rl32(pb); |
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}
// 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;
}
|
588eaa10 |
#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); |
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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 < 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
|
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static int swf_read_header(AVFormatContext *s) |
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{
SWFContext *swf = s->priv_data; |
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AVIOContext *pb = s->pb; |
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int nbits, len, tag;
|
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tag = avio_rb32(pb) & 0xffffff00; |
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avio_rl32(pb); |
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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"); |
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return AVERROR(EIO); |
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#endif
} else if (tag != MKBETAG('F', 'W', 'S', 0)) |
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return AVERROR(EIO);
/* skip rectangle size */ |
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nbits = avio_r8(pb) >> 3; |
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len = (4 * nbits - 3 + 7) / 8; |
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avio_skip(pb, len); |
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swf->frame_rate = avio_rl16(pb); /* 8.8 fixed */
avio_rl16(pb); /* frame count */ |
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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; |
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AVIOContext *pb = s->pb; |
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AVStream *vst = NULL, *ast = NULL, *st = 0; |
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int tag, len, i, frame, v, res; |
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|
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#if CONFIG_ZLIB
if (swf->zpb)
pb = swf->zpb;
#endif
|
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for(;;) { |
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uint64_t pos = avio_tell(pb); |
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tag = get_swf_tag(pb, &len);
if (tag < 0) |
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return tag; |
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if (len < 0) { |
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av_log(s, AV_LOG_ERROR, "invalid tag length: %d\n", len); |
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return AVERROR_INVALIDDATA;
} |
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if (tag == TAG_VIDEOSTREAM) { |
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int ch_id = avio_rl16(pb); |
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len -= 2;
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i]; |
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if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) |
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goto skip;
}
|
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avio_rl16(pb);
avio_rl16(pb);
avio_rl16(pb);
avio_r8(pb); |
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/* Check for FLV1 */ |
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vst = avformat_new_stream(s, NULL); |
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if (!vst)
return -1; |
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vst->id = ch_id; |
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->codec->codec_id = ff_codec_get_id(ff_swf_codec_tags, avio_r8(pb)); |
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avpriv_set_pts_info(vst, 16, 256, swf->frame_rate); |
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len -= 8;
} else if (tag == TAG_STREAMHEAD || tag == TAG_STREAMHEAD2) { |
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/* streaming found */
int sample_rate_code; |
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for (i=0; i<s->nb_streams; i++) {
st = s->streams[i]; |
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if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) |
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goto skip;
}
|
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avio_r8(pb);
v = avio_r8(pb);
swf->samples_per_frame = avio_rl16(pb); |
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ast = avformat_new_stream(s, NULL); |
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if (!ast)
return -1; |
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ast->id = -1; /* -1 to avoid clash with video stream ch_id */ |
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ast->codec->channels = 1 + (v&1); |
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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ast->codec->codec_id = ff_codec_get_id(swf_audio_codec_tags, (v>>4) & 15); |
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ast->need_parsing = AVSTREAM_PARSE_FULL;
sample_rate_code= (v>>2) & 3; |
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ast->codec->sample_rate = 44100 >> (3 - sample_rate_code); |
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avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
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len -= 4;
} else if (tag == TAG_VIDEOFRAME) { |
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int ch_id = avio_rl16(pb); |
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len -= 2;
for(i=0; i<s->nb_streams; i++) {
st = s->streams[i]; |
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if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) { |
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frame = avio_rl16(pb); |
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len -= 2;
if (len <= 0)
goto skip;
if ((res = av_get_packet(pb, pkt, len)) < 0) |
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return res; |
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pkt->pos = pos; |
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pkt->pts = frame;
pkt->stream_index = st->index;
return pkt->size;
}
}
} else if (tag == TAG_STREAMBLOCK) { |
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for (i = 0; i < s->nb_streams; i++) {
st = s->streams[i]; |
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if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) { |
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if (st->codec->codec_id == AV_CODEC_ID_MP3) { |
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avio_skip(pb, 4); |
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len -= 4;
if (len <= 0)
goto skip;
if ((res = av_get_packet(pb, pkt, len)) < 0) |
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return res; |
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} else { // ADPCM, PCM |
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if (len <= 0)
goto skip; |
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if ((res = av_get_packet(pb, pkt, len)) < 0)
return res; |
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} |
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pkt->pos = pos; |
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pkt->stream_index = st->index;
return pkt->size; |
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}
} |
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} else if (tag == TAG_JPEG2) {
for (i=0; i<s->nb_streams; i++) {
st = s->streams[i]; |
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if (st->codec->codec_id == AV_CODEC_ID_MJPEG && st->id == -2) |
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break;
}
if (i == s->nb_streams) { |
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vst = avformat_new_stream(s, NULL); |
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if (!vst)
return -1; |
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vst->id = -2; /* -2 to avoid clash with video stream and audio stream */ |
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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vst->codec->codec_id = AV_CODEC_ID_MJPEG; |
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avpriv_set_pts_info(vst, 64, 256, swf->frame_rate); |
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st = vst;
} |
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avio_rl16(pb); /* BITMAP_ID */ |
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len -= 2;
if (len < 4)
goto skip;
if ((res = av_new_packet(pkt, len)) < 0) |
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return res; |
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avio_read(pb, pkt->data, 4); |
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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; |
e63a3628 |
avio_read(pb, pkt->data, pkt->size); |
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} else { |
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avio_read(pb, pkt->data + 4, pkt->size - 4); |
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} |
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pkt->pos = pos; |
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pkt->stream_index = st->index;
return pkt->size;
} |
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skip: |
d46713cc |
len = FFMAX(0, len); |
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avio_skip(pb, len); |
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}
}
|
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#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
|
66355be3 |
AVInputFormat ff_swf_demuxer = { |
dfc2c4d9 |
.name = "swf", |
0177b7d2 |
.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"), |
dfc2c4d9 |
.priv_data_size = sizeof(SWFContext),
.read_probe = swf_probe,
.read_header = swf_read_header,
.read_packet = swf_read_packet, |
588eaa10 |
#if CONFIG_ZLIB
.read_close = swf_read_close,
#endif |
3b35f4ab |
}; |