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ffmpeg/libavformat/smacker.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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/*
* 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 "libavutil/mem.h"
#include "avformat.h"
#include "avio_internal.h"
#include "demux.h"
#include "internal.h"
#define SMACKER_PAL 0x01
#define SMACKER_FLAG_RING_FRAME 0x01
#define SMACKER_FLAG_Y_INTERLACE (1 << 1)
#define SMACKER_FLAG_Y_DOUBLE (1 << 2)
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;
int64_t pos;
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;
st->sample_aspect_ratio = (AVRational){ 1, 1 +
!!(flags & (SMACKER_FLAG_Y_INTERLACE | SMACKER_FLAG_Y_DOUBLE)) };
/* 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;
}
av_channel_layout_default(&par->ch_layout,
!!(aflag & SMK_AUD_STEREO) + 1);
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->ch_layout.nb_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 */
pos = 0;
for (i = 0; i < smk->frames; i++) {
smk->frm_size[i] = avio_rl32(pb);
if ((ret = av_add_index_entry(st, pos, i, smk->frm_size[i], 0,
(i == 0 || (smk->frm_size[i] & 1)) ? AVINDEX_KEYFRAME : 0)) < 0)
return ret;
pos += smk->frm_size[i];
}
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) || smk->cur_frame == 0)
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;
pkt->duration = 1;
if (flags & 2)
pkt->flags |= AV_PKT_FLAG_KEY;
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)
{
AVStream *st = s->streams[stream_index];
SmackerContext *smk = s->priv_data;
int64_t pos;
int ret;
if (!(s->pb->seekable & AVIO_SEEKABLE_NORMAL))
return -1;
if (timestamp < 0 || timestamp >= smk->frames)
return AVERROR(EINVAL);
ret = av_index_search_timestamp(st, timestamp, flags);
if (ret < 0)
return ret;
pos = ffformatcontext(s)->data_offset;
pos += ffstream(st)->index_entries[ret].pos;
pos = avio_seek(s->pb, pos, SEEK_SET);
if (pos < 0)
return pos;
smk->cur_frame = ret;
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 FFInputFormat ff_smacker_demuxer = {
.p.name = "smk",
.p.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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