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ffmpeg/libavformat/swfdec.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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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 "libavutil/mem.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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