0,0 → 1,489 |
/* |
* 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/avassert.h" |
#include "libavutil/channel_layout.h" |
#include "libavutil/imgutils.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 (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 AVStream *create_new_audio_stream(AVFormatContext *s, int id, int info) |
{ |
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->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, info>>4 & 15); |
ast->need_parsing = AVSTREAM_PARSE_FULL; |
sample_rate_code = info>>2 & 3; |
sample_size_code = info>>1 & 1; |
if (!sample_size_code && ast->codec->codec_id == AV_CODEC_ID_PCM_S16LE) |
ast->codec->codec_id = AV_CODEC_ID_PCM_U8; |
ast->codec->sample_rate = 44100 >> (3 - sample_rate_code); |
avpriv_set_pts_info(ast, 64, 1, ast->codec->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; |
|
#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]; |
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 AVERROR(ENOMEM); |
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 */ |
|
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 = 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->codec->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]; |
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_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); |
|
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; |
|
av_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->codec->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->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
vst->codec->codec_id = AV_CODEC_ID_RAWVIDEO; |
avpriv_set_pts_info(vst, 64, 256, swf->frame_rate); |
st = vst; |
} |
st->codec->width = width; |
st->codec->height = height; |
|
if ((res = av_new_packet(pkt, out_len - colormapsize * colormapbpp)) < 0) |
goto bitmap_end; |
pkt->pos = pos; |
pkt->stream_index = st->index; |
|
switch (bmp_fmt) { |
case 3: |
st->codec->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: |
st->codec->pix_fmt = AV_PIX_FMT_RGB555; |
break; |
case 5: |
st->codec->pix_fmt = alpha_bmp ? AV_PIX_FMT_ARGB : AV_PIX_FMT_0RGB; |
break; |
default: |
av_assert0(0); |
} |
|
if (linesize * height > pkt->size) { |
res = AVERROR_INVALIDDATA; |
goto bitmap_end; |
} |
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]; |
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 AVERROR(ENOMEM); |
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; |
} else { |
av_log(s, AV_LOG_DEBUG, "Unknown tag: %d\n", tag); |
} |
skip: |
if(len<0) |
av_log(s, AV_LOG_WARNING, "Cliping len %d\n", len); |
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 |
}; |