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FFmpeg/libavformat/smacker.c
Andreas Rheinhardt fed0282508 avformat: Avoid allocation for AVFormatInternal 
Do this by allocating AVFormatContext together with the data that is
currently in AVFormatInternal; or rather: Put AVFormatContext at the
beginning of a new structure called FFFormatContext (which encompasses
more than just the internal fields and is a proper context in its own
right, hence the name) and remove AVFormatInternal altogether.

The biggest simplifications occured in avformat_alloc_context(), where
one can now simply call avformat_free_context() in case of errors.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-09-17 04:58:34 +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 {
uint32_t frames;
/* frame info */
uint32_t *frm_size;
uint8_t *frm_flags;
/* internal variables */
int64_t next_frame_pos;
int cur_frame;
int videoindex;
int indexes[7];
int duration_size[7];
/* current frame for demuxing */
uint32_t frame_size;
int flags;
int next_audio_index;
int new_palette;
uint8_t pal[768];
int64_t aud_pts[7];
} SmackerContext;
/* 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;
AVCodecParameters *par;
uint32_t magic, width, height, flags, treesize;
int i, ret, pts_inc;
int tbase;
/* read and check header */
magic = avio_rl32(pb);
if (magic != MKTAG('S', 'M', 'K', '2') && magic != MKTAG('S', 'M', 'K', '4'))
return AVERROR_INVALIDDATA;
width = avio_rl32(pb);
height = avio_rl32(pb);
smk->frames = avio_rl32(pb);
pts_inc = avio_rl32(pb);
if (pts_inc > INT_MAX / 100 || pts_inc == INT_MIN) {
av_log(s, AV_LOG_ERROR, "pts_inc %d is invalid\n", pts_inc);
return AVERROR_INVALIDDATA;
}
flags = avio_rl32(pb);
if (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;
}
avio_skip(pb, 28); /* Unused audio related data */
treesize = avio_rl32(pb);
if (treesize >= UINT_MAX/4) {
// 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);
smk->videoindex = st->index;
/* Smacker uses 100000 as internal timebase */
if (pts_inc < 0)
pts_inc = -pts_inc;
else
pts_inc *= 100;
tbase = 100000;
av_reduce(&tbase, &pts_inc, tbase, pts_inc, (1UL << 31) - 1);
avpriv_set_pts_info(st, 33, pts_inc, tbase);
st->duration = smk->frames;
/* init video codec */
par = st->codecpar;
par->width = width;
par->height = height;
par->format = AV_PIX_FMT_PAL8;
par->codec_type = AVMEDIA_TYPE_VIDEO;
par->codec_id = AV_CODEC_ID_SMACKVIDEO;
par->codec_tag = magic;
if ((ret = ff_alloc_extradata(par, treesize + 16)) < 0) {
av_log(s, AV_LOG_ERROR,
"Cannot allocate %"PRIu32" bytes of extradata\n",
treesize + 16);
return ret;
}
if ((ret = ffio_read_size(pb, par->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);
AVCodecParameters *par;
if (!ast)
return AVERROR(ENOMEM);
smk->indexes[i] = ast->index;
par = ast->codecpar;
par->codec_type = AVMEDIA_TYPE_AUDIO;
if (aflag & SMK_AUD_BINKAUD) {
par->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
} else if (aflag & SMK_AUD_USEDCT) {
par->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
} else if (aflag & SMK_AUD_PACKED) {
par->codec_id = AV_CODEC_ID_SMACKAUDIO;
par->codec_tag = MKTAG('S', 'M', 'K', 'A');
} else {
par->codec_id = AV_CODEC_ID_PCM_U8;
}
if (aflag & SMK_AUD_STEREO) {
par->channels = 2;
par->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
par->channels = 1;
par->channel_layout = AV_CH_LAYOUT_MONO;
}
par->sample_rate = rate;
par->bits_per_coded_sample = (aflag & SMK_AUD_16BITS) ? 16 : 8;
if (par->bits_per_coded_sample == 16 &&
par->codec_id == AV_CODEC_ID_PCM_U8)
par->codec_id = AV_CODEC_ID_PCM_S16LE;
else
smk->duration_size[i] = 4;
avpriv_set_pts_info(ast, 64, 1, par->sample_rate * par->channels
* par->bits_per_coded_sample / 8);
}
}
avio_rl32(pb); /* padding */
/* setup data */
st->priv_data = av_malloc_array(smk->frames, sizeof(*smk->frm_size) +
sizeof(*smk->frm_flags));
if (!st->priv_data)
return AVERROR(ENOMEM);
smk->frm_size = st->priv_data;
smk->frm_flags = (void*)(smk->frm_size + smk->frames);
/* read frame info */
for (i = 0; i < smk->frames; i++) {
smk->frm_size[i] = avio_rl32(pb);
}
if ((ret = ffio_read_size(pb, smk->frm_flags, smk->frames)) < 0 ||
/* load trees to extradata, they will be unpacked by decoder */
(ret = ffio_read_size(pb, par->extradata + 16,
par->extradata_size - 16)) < 0) {
return ret;
}
return 0;
}
static int smacker_read_packet(AVFormatContext *s, AVPacket *pkt)
{
SmackerContext *smk = s->priv_data;
int flags;
int ret;
if (avio_feof(s->pb) || smk->cur_frame >= smk->frames)
return AVERROR_EOF;
/* if we demuxed all streams, pass another frame */
if (!smk->next_audio_index) {
smk->frame_size = smk->frm_size[smk->cur_frame] & (~3);
smk->next_frame_pos = avio_tell(s->pb) + smk->frame_size;
flags = smk->frm_flags[smk->cur_frame];
smk->flags = flags >> 1;
/* 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;
if (size > smk->frame_size) {
ret = AVERROR_INVALIDDATA;
goto next_frame;
}
smk->frame_size -= 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);
ret = AVERROR_INVALIDDATA;
goto next_frame;
}
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);
smk->new_palette = 1;
}
}
for (int i = smk->next_audio_index; i < 7; i++) {
if (smk->flags & (1 << i)) {
uint32_t size;
size = avio_rl32(s->pb);
if ((int)size < 4 + smk->duration_size[i] || size > smk->frame_size) {
av_log(s, AV_LOG_ERROR, "Invalid audio part size\n");
ret = AVERROR_INVALIDDATA;
goto next_frame;
}
smk->frame_size -= size;
size -= 4;
if (smk->indexes[i] < 0 ||
s->streams[smk->indexes[i]]->discard >= AVDISCARD_ALL) {
smk->aud_pts[i] += smk->duration_size[i] ? avio_rl32(s->pb)
: size;
avio_skip(s->pb, size - smk->duration_size[i]);
continue;
}
if ((ret = av_get_packet(s->pb, pkt, size)) != size) {
ret = ret < 0 ? ret : AVERROR_INVALIDDATA;
goto next_frame;
}
pkt->stream_index = smk->indexes[i];
pkt->pts = smk->aud_pts[i];
pkt->duration = smk->duration_size[i] ? AV_RL32(pkt->data)
: size;
smk->aud_pts[i] += pkt->duration;
smk->next_audio_index = i + 1;
return 0;
}
}
if (s->streams[smk->videoindex]->discard >= AVDISCARD_ALL) {
ret = FFERROR_REDO;
goto next_frame;
}
if (smk->frame_size >= INT_MAX/2) {
ret = AVERROR_INVALIDDATA;
goto next_frame;
}
if ((ret = av_new_packet(pkt, smk->frame_size + 769)) < 0)
goto next_frame;
flags = smk->new_palette;
if (smk->frm_size[smk->cur_frame] & 1)
flags |= 2;
pkt->data[0] = flags;
memcpy(pkt->data + 1, smk->pal, 768);
ret = ffio_read_size(s->pb, pkt->data + 769, smk->frame_size);
if (ret < 0)
goto next_frame;
pkt->stream_index = smk->videoindex;
pkt->pts = smk->cur_frame;
smk->next_audio_index = 0;
smk->new_palette = 0;
smk->cur_frame++;
return 0;
next_frame:
avio_seek(s->pb, smk->next_frame_pos, SEEK_SET);
smk->next_audio_index = 0;
smk->cur_frame++;
return ret;
}
static int smacker_read_seek(AVFormatContext *s, int stream_index,
int64_t timestamp, int flags)
{
SmackerContext *smk = s->priv_data;
int64_t ret;
/* only rewinding to start is supported */
if (timestamp != 0) {
av_log(s, AV_LOG_ERROR,
"Random seeks are not supported (can only seek to start).\n");
return AVERROR(EINVAL);
}
if ((ret = avio_seek(s->pb, ffformatcontext(s)->data_offset, SEEK_SET)) < 0)
return ret;
smk->cur_frame = 0;
smk->next_audio_index = 0;
smk->new_palette = 0;
memset(smk->pal, 0, sizeof(smk->pal));
memset(smk->aud_pts, 0, sizeof(smk->aud_pts));
return 0;
}
const 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_seek = smacker_read_seek,
};
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