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ffmpeg/libavformat/smacker.c
Andreas Rheinhardt 33bc45e4fc avformat/smacker: Create audio streams immediately 
The Smacker demuxer currently parses several fields that indicate
how many audio streams a file contains. This data is parsed and stored
into arrays in the demuxer's context and although the data is used only
to initialize the audio streams, it is kept for the whole lifetime of
the demuxer.

This has been changed: The data is used directly to create
the audio streams and no longer kept at all.

This also simplifies error handling in case adding a new stream fails:
Several arrays which until now have been allocated between parsing the
data determining how many audio streams to create and actually creating
them would need to be freed in this case. Now the streams are created
first, so freeing is no longer an issue.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-04-08 16:04:37 +02:00

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/*
* Smacker demuxer
* Copyright (c) 2006 Konstantin Shishkov
*
* 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
*/
/*
* Based on http://wiki.multimedia.cx/index.php?title=Smacker
*/
#include <inttypes.h>
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#define SMACKER_PAL 0x01
#define SMACKER_FLAG_RING_FRAME 0x01
enum SAudFlags {
SMK_AUD_PACKED = 0x80,
SMK_AUD_16BITS = 0x20,
SMK_AUD_STEREO = 0x10,
SMK_AUD_BINKAUD = 0x08,
SMK_AUD_USEDCT = 0x04
};
typedef struct SmackerContext {
/* Smacker file header */
uint32_t magic;
uint32_t width, height;
uint32_t frames;
int pts_inc;
uint32_t flags;
uint32_t audio[7];
uint32_t treesize;
uint32_t pad;
/* frame info */
uint32_t *frm_size;
uint8_t *frm_flags;
/* internal variables */
int cur_frame;
int is_ver4;
int64_t cur_pts;
/* current frame for demuxing */
uint8_t pal[768];
int indexes[7];
int videoindex;
uint8_t *bufs[7];
int buf_sizes[7];
int stream_id[7];
int curstream;
int64_t nextpos;
int64_t aud_pts[7];
} SmackerContext;
typedef struct SmackerFrame {
int64_t pts;
int stream;
} SmackerFrame;
/* palette used in Smacker */
static const uint8_t smk_pal[64] = {
0x00, 0x04, 0x08, 0x0C, 0x10, 0x14, 0x18, 0x1C,
0x20, 0x24, 0x28, 0x2C, 0x30, 0x34, 0x38, 0x3C,
0x41, 0x45, 0x49, 0x4D, 0x51, 0x55, 0x59, 0x5D,
0x61, 0x65, 0x69, 0x6D, 0x71, 0x75, 0x79, 0x7D,
0x82, 0x86, 0x8A, 0x8E, 0x92, 0x96, 0x9A, 0x9E,
0xA2, 0xA6, 0xAA, 0xAE, 0xB2, 0xB6, 0xBA, 0xBE,
0xC3, 0xC7, 0xCB, 0xCF, 0xD3, 0xD7, 0xDB, 0xDF,
0xE3, 0xE7, 0xEB, 0xEF, 0xF3, 0xF7, 0xFB, 0xFF
};
static int smacker_probe(const AVProbeData *p)
{
if ( AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '2')
&& AV_RL32(p->buf) != MKTAG('S', 'M', 'K', '4'))
return 0;
if (AV_RL32(p->buf+4) > 32768U || AV_RL32(p->buf+8) > 32768U)
return AVPROBE_SCORE_MAX/4;
return AVPROBE_SCORE_MAX;
}
static int smacker_read_header(AVFormatContext *s)
{
AVIOContext *pb = s->pb;
SmackerContext *smk = s->priv_data;
AVStream *st;
int i, ret;
int tbase;
/* read and check header */
smk->magic = avio_rl32(pb);
if (smk->magic != MKTAG('S', 'M', 'K', '2') && smk->magic != MKTAG('S', 'M', 'K', '4'))
return AVERROR_INVALIDDATA;
smk->width = avio_rl32(pb);
smk->height = avio_rl32(pb);
smk->frames = avio_rl32(pb);
smk->pts_inc = (int32_t)avio_rl32(pb);
if (smk->pts_inc > INT_MAX / 100) {
av_log(s, AV_LOG_ERROR, "pts_inc %d is too large\n", smk->pts_inc);
return AVERROR_INVALIDDATA;
}
smk->flags = avio_rl32(pb);
if(smk->flags & SMACKER_FLAG_RING_FRAME)
smk->frames++;
if (smk->frames > 0xFFFFFF) {
av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
return AVERROR_INVALIDDATA;
}
for(i = 0; i < 7; i++)
smk->audio[i] = avio_rl32(pb);
smk->treesize = avio_rl32(pb);
if(smk->treesize >= UINT_MAX/4){ // smk->treesize + 16 must not overflow (this check is probably redundant)
av_log(s, AV_LOG_ERROR, "treesize too large\n");
return AVERROR_INVALIDDATA;
}
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
if ((ret = ff_alloc_extradata(st->codecpar, smk->treesize + 16)) < 0) {
av_log(s, AV_LOG_ERROR,
"Cannot allocate %"PRIu32" bytes of extradata\n",
smk->treesize + 16);
return ret;
}
if ((ret = ffio_read_size(pb, st->codecpar->extradata, 16)) < 0)
return ret;
/* handle possible audio streams */
for(i = 0; i < 7; i++) {
uint32_t rate = avio_rl24(pb);
uint8_t aflag = avio_r8(pb);
smk->indexes[i] = -1;
if (rate) {
AVStream *ast = avformat_new_stream(s, NULL);
if (!ast)
return AVERROR(ENOMEM);
smk->indexes[i] = ast->index;
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
if (aflag & SMK_AUD_BINKAUD) {
ast->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
} else if (aflag & SMK_AUD_USEDCT) {
ast->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
} else if (aflag & SMK_AUD_PACKED) {
ast->codecpar->codec_id = AV_CODEC_ID_SMACKAUDIO;
ast->codecpar->codec_tag = MKTAG('S', 'M', 'K', 'A');
} else {
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
}
if (aflag & SMK_AUD_STEREO) {
ast->codecpar->channels = 2;
ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
ast->codecpar->channels = 1;
ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
}
ast->codecpar->sample_rate = rate;
ast->codecpar->bits_per_coded_sample = (aflag & SMK_AUD_16BITS) ? 16 : 8;
if (ast->codecpar->bits_per_coded_sample == 16 &&
ast->codecpar->codec_id == AV_CODEC_ID_PCM_U8)
ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate
* ast->codecpar->channels * ast->codecpar->bits_per_coded_sample / 8);
}
}
smk->pad = avio_rl32(pb);
/* setup data */
smk->frm_size = av_malloc_array(smk->frames, sizeof(*smk->frm_size));
smk->frm_flags = av_malloc(smk->frames);
if (!smk->frm_size || !smk->frm_flags) {
av_freep(&smk->frm_size);
av_freep(&smk->frm_flags);
return AVERROR(ENOMEM);
}
smk->is_ver4 = (smk->magic != MKTAG('S', 'M', 'K', '2'));
/* read frame info */
for(i = 0; i < smk->frames; i++) {
smk->frm_size[i] = avio_rl32(pb);
}
for(i = 0; i < smk->frames; i++) {
smk->frm_flags[i] = avio_r8(pb);
}
/* init video codec */
smk->videoindex = st->index;
st->codecpar->width = smk->width;
st->codecpar->height = smk->height;
st->codecpar->format = AV_PIX_FMT_PAL8;
st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
st->codecpar->codec_id = AV_CODEC_ID_SMACKVIDEO;
st->codecpar->codec_tag = smk->magic;
/* Smacker uses 100000 as internal timebase */
if(smk->pts_inc < 0)
smk->pts_inc = -smk->pts_inc;
else
smk->pts_inc *= 100;
tbase = 100000;
av_reduce(&tbase, &smk->pts_inc, tbase, smk->pts_inc, (1UL<<31)-1);
avpriv_set_pts_info(st, 33, smk->pts_inc, tbase);
st->duration = smk->frames;
/* load trees to extradata, they will be unpacked by decoder */
ret = avio_read(pb, st->codecpar->extradata + 16, st->codecpar->extradata_size - 16);
if(ret != st->codecpar->extradata_size - 16){
av_freep(&smk->frm_size);
av_freep(&smk->frm_flags);
return AVERROR(EIO);
}
smk->curstream = -1;
smk->nextpos = avio_tell(pb);
return 0;
}
static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
{
SmackerContext *smk = s->priv_data;
int flags;
int ret;
int i;
int frame_size = 0;
int palchange = 0;
if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
return AVERROR_EOF;
/* if we demuxed all streams, pass another frame */
if(smk->curstream < 0) {
avio_seek(s->pb, smk->nextpos, 0);
frame_size = smk->frm_size[smk->cur_frame] & (~3);
flags = smk->frm_flags[smk->cur_frame];
/* handle palette change event */
if(flags & SMACKER_PAL){
int size, sz, t, off, j, pos;
uint8_t *pal = smk->pal;
uint8_t oldpal[768];
memcpy(oldpal, pal, 768);
size = avio_r8(s->pb);
size = size * 4 - 1;
if(size + 1 > frame_size)
return AVERROR_INVALIDDATA;
frame_size -= size;
frame_size--;
sz = 0;
pos = avio_tell(s->pb) + size;
while(sz < 256){
t = avio_r8(s->pb);
if(t & 0x80){ /* skip palette entries */
sz += (t & 0x7F) + 1;
pal += ((t & 0x7F) + 1) * 3;
} else if(t & 0x40){ /* copy with offset */
off = avio_r8(s->pb);
j = (t & 0x3F) + 1;
if (off + j > 0x100) {
av_log(s, AV_LOG_ERROR,
"Invalid palette update, offset=%d length=%d extends beyond palette size\n",
off, j);
return AVERROR_INVALIDDATA;
}
off *= 3;
while(j-- && sz < 256) {
*pal++ = oldpal[off + 0];
*pal++ = oldpal[off + 1];
*pal++ = oldpal[off + 2];
sz++;
off += 3;
}
} else { /* new entries */
*pal++ = smk_pal[t];
*pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
*pal++ = smk_pal[avio_r8(s->pb) & 0x3F];
sz++;
}
}
avio_seek(s->pb, pos, 0);
palchange |= 1;
}
flags >>= 1;
smk->curstream = -1;
/* if audio chunks are present, put them to stack and retrieve later */
for(i = 0; i < 7; i++) {
if(flags & 1) {
uint32_t size;
int err;
size = avio_rl32(s->pb) - 4;
if (!size || size + 4LL > frame_size) {
av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
return AVERROR_INVALIDDATA;
}
frame_size -= size;
frame_size -= 4;
smk->curstream++;
if ((err = av_reallocp(&smk->bufs[smk->curstream], size)) < 0) {
smk->buf_sizes[smk->curstream] = 0;
return err;
}
smk->buf_sizes[smk->curstream] = size;
ret = avio_read(s->pb, smk->bufs[smk->curstream], size);
if(ret != size)
return AVERROR(EIO);
smk->stream_id[smk->curstream] = smk->indexes[i];
}
flags >>= 1;
}
if (frame_size < 0 || frame_size >= INT_MAX/2)
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(pkt, frame_size + 769)) < 0)
return ret;
if(smk->frm_size[smk->cur_frame] & 1)
palchange |= 2;
pkt->data[0] = palchange;
memcpy(pkt->data + 1, smk->pal, 768);
ret = avio_read(s->pb, pkt->data + 769, frame_size);
if(ret != frame_size)
return AVERROR(EIO);
pkt->stream_index = smk->videoindex;
pkt->pts = smk->cur_frame;
pkt->size = ret + 769;
smk->cur_frame++;
smk->nextpos = avio_tell(s->pb);
} else {
if (smk->stream_id[smk->curstream] < 0 || !smk->bufs[smk->curstream])
return AVERROR_INVALIDDATA;
if ((ret = av_new_packet(pkt, smk->buf_sizes[smk->curstream])) < 0)
return ret;
memcpy(pkt->data, smk->bufs[smk->curstream], smk->buf_sizes[smk->curstream]);
pkt->size = smk->buf_sizes[smk->curstream];
pkt->stream_index = smk->stream_id[smk->curstream];
pkt->pts = smk->aud_pts[smk->curstream];
smk->aud_pts[smk->curstream] += AV_RL32(pkt->data);
smk->curstream--;
}
return 0;
}
static int smacker_read_close(AVFormatContext *s)
{
SmackerContext *smk = s->priv_data;
int i;
for(i = 0; i < 7; i++)
av_freep(&smk->bufs[i]);
av_freep(&smk->frm_size);
av_freep(&smk->frm_flags);
return 0;
}
AVInputFormat ff_smacker_demuxer = {
.name = "smk",
.long_name = NULL_IF_CONFIG_SMALL("Smacker"),
.priv_data_size = sizeof(SmackerContext),
.read_probe = smacker_probe,
.read_header = smacker_read_header,
.read_packet = smacker_read_packet,
.read_close = smacker_read_close,
};
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