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FFmpeg/libavformat/smacker.c
Andreas Rheinhardt c1e439d7e9 avformat: Forward errors where possible 
It is not uncommon to find code where the caller thinks to know better
what the return value should be than the callee. E.g. something like
"if (av_new_packet(pkt, size) < 0) return AVERROR(ENOMEM);". This commit
changes several instances of this to instead forward the actual error.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
2019-12-12 19:25:33 +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/bswap.h"
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.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 mmap_size, mclr_size, full_size, type_size;
uint8_t aflags[7];
uint32_t rates[7];
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, *ast[7];
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++;
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;
}
//FIXME remove extradata "rebuilding"
smk->mmap_size = avio_rl32(pb);
smk->mclr_size = avio_rl32(pb);
smk->full_size = avio_rl32(pb);
smk->type_size = avio_rl32(pb);
for(i = 0; i < 7; i++) {
smk->rates[i] = avio_rl24(pb);
smk->aflags[i] = avio_r8(pb);
}
smk->pad = avio_rl32(pb);
/* setup data */
if(smk->frames > 0xFFFFFF) {
av_log(s, AV_LOG_ERROR, "Too many frames: %"PRIu32"\n", smk->frames);
return AVERROR_INVALIDDATA;
}
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 */
st = avformat_new_stream(s, NULL);
if (!st) {
av_freep(&smk->frm_size);
av_freep(&smk->frm_flags);
return AVERROR(ENOMEM);
}
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;
/* handle possible audio streams */
for(i = 0; i < 7; i++) {
smk->indexes[i] = -1;
if (smk->rates[i]) {
ast[i] = avformat_new_stream(s, NULL);
if (!ast[i]) {
av_freep(&smk->frm_size);
av_freep(&smk->frm_flags);
return AVERROR(ENOMEM);
}
smk->indexes[i] = ast[i]->index;
ast[i]->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
if (smk->aflags[i] & SMK_AUD_BINKAUD) {
ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_RDFT;
} else if (smk->aflags[i] & SMK_AUD_USEDCT) {
ast[i]->codecpar->codec_id = AV_CODEC_ID_BINKAUDIO_DCT;
} else if (smk->aflags[i] & SMK_AUD_PACKED){
ast[i]->codecpar->codec_id = AV_CODEC_ID_SMACKAUDIO;
ast[i]->codecpar->codec_tag = MKTAG('S', 'M', 'K', 'A');
} else {
ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
}
if (smk->aflags[i] & SMK_AUD_STEREO) {
ast[i]->codecpar->channels = 2;
ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
} else {
ast[i]->codecpar->channels = 1;
ast[i]->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
}
ast[i]->codecpar->sample_rate = smk->rates[i];
ast[i]->codecpar->bits_per_coded_sample = (smk->aflags[i] & SMK_AUD_16BITS) ? 16 : 8;
if(ast[i]->codecpar->bits_per_coded_sample == 16 && ast[i]->codecpar->codec_id == AV_CODEC_ID_PCM_U8)
ast[i]->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
avpriv_set_pts_info(ast[i], 64, 1, ast[i]->codecpar->sample_rate
* ast[i]->codecpar->channels * ast[i]->codecpar->bits_per_coded_sample / 8);
}
}
/* load trees to extradata, they will be unpacked by decoder */
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);
av_freep(&smk->frm_size);
av_freep(&smk->frm_flags);
return ret;
}
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);
}
((int32_t*)st->codecpar->extradata)[0] = av_le2ne32(smk->mmap_size);
((int32_t*)st->codecpar->extradata)[1] = av_le2ne32(smk->mclr_size);
((int32_t*)st->codecpar->extradata)[2] = av_le2ne32(smk->full_size);
((int32_t*)st->codecpar->extradata)[3] = av_le2ne32(smk->type_size);
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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