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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"
#include "libavutil/channel_layout.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavcodec/get_bits.h"
#include "demux.h"
#include "swf.h"
#include "flv.h"
typedef struct SWFDecContext {
int samples_per_frame;
int frame_rate;
#if CONFIG_ZLIB
#define ZBUF_SIZE 4096
AVIOContext *zpb;
uint8_t *zbuf_in;
uint8_t *zbuf_out;
z_stream zstream;
#endif
} SWFDecContext;
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(const 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 + 8, p->buf_size - 8) < 0)
return 0;
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;
}
#if CONFIG_ZLIB
static int zlib_refill(void *opaque, uint8_t *buf, int buf_size)
{
AVFormatContext *s = opaque;
SWFDecContext *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_STREAM_END)
return AVERROR_EOF;
if (ret != Z_OK)
return AVERROR(EINVAL);
if (buf_size - z->avail_out == 0)
goto retry;
return buf_size - z->avail_out;
}
static av_cold int swf_read_close(AVFormatContext *avctx);
#endif
static int swf_read_header(AVFormatContext *s)
{
SWFDecContext *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
if (inflateInit(&swf->zstream) != Z_OK) {
av_log(s, AV_LOG_ERROR, "Unable to init zlib context\n");
return AVERROR(EINVAL);
}
if (!(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))) {
swf_read_close(s);
return AVERROR(ENOMEM);
}
swf->zpb->seekable = 0;
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;
av_channel_layout_default(&ast->codecpar->ch_layout, 1 + (info & 1));
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_id = ff_codec_get_id(swf_audio_codec_tags, info>>4 & 15);
ffstream(ast)->need_parsing = AVSTREAM_PARSE_FULL;
sample_rate_code = info>>2 & 3;
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)
{
SWFDecContext *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->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;
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];
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
ffstream(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->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->id == ch_id) {
int pkt_flags = 0;
frame = avio_rl16(pb);
len -= 2;
if (len <= 0)
goto skip;
if (st->codecpar->codec_id == AV_CODEC_ID_FLASHSV) {
unsigned flags = avio_r8(pb);
len--;
if (len <= 0)
goto skip;
pkt_flags |= (flags & FLV_VIDEO_FRAMETYPE_MASK) == FLV_FRAME_KEY ? AV_PKT_FLAG_KEY : 0;
}
if ((res = av_get_packet(pb, pkt, len)) < 0)
return res;
pkt->pos = pos;
pkt->pts = frame;
pkt->stream_index = st->index;
pkt->flags |= pkt_flags;
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);
if (len * 17373LL < out_len)
goto bitmap_end_skip;
zbuf = av_malloc(len);
if (!zbuf) {
res = AVERROR(ENOMEM);
goto bitmap_end;
}
len = avio_read(pb, zbuf, len);
if (len < 0)
goto bitmap_end_skip;
buf = av_malloc(out_len);
if (!buf) {
res = AVERROR(ENOMEM);
goto bitmap_end;
}
if ((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;
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];
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO && st->id == -1) {
if (st->codecpar->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->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 */
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) {
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) {
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);
}
}
#if CONFIG_ZLIB
static av_cold int swf_read_close(AVFormatContext *avctx)
{
SWFDecContext *s = avctx->priv_data;
inflateEnd(&s->zstream);
av_freep(&s->zbuf_in);
av_freep(&s->zbuf_out);
avio_context_free(&s->zpb);
return 0;
}
#endif
const FFInputFormat ff_swf_demuxer = {
.p.name = "swf",
.p.long_name = NULL_IF_CONFIG_SMALL("SWF (ShockWave Flash)"),
.priv_data_size = sizeof(SWFDecContext),
.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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