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FFmpeg/libavformat/sierravmd.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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/*
* Sierra VMD Format Demuxer
* Copyright (c) 2004 The FFmpeg project
*
* 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
*/
/**
* @file
* Sierra VMD file demuxer
* by Vladimir "VAG" Gneushev (vagsoft at mail.ru)
* for more information on the Sierra VMD file format, visit:
* http://www.pcisys.net/~melanson/codecs/
*/
#include "libavutil/channel_layout.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
#include "avio_internal.h"
#define VMD_HEADER_SIZE 0x0330
#define BYTES_PER_FRAME_RECORD 16
typedef struct vmd_frame {
int stream_index;
int64_t frame_offset;
unsigned int frame_size;
int64_t pts;
int keyframe;
unsigned char frame_record[BYTES_PER_FRAME_RECORD];
} vmd_frame;
typedef struct VmdDemuxContext {
int video_stream_index;
int audio_stream_index;
unsigned int frame_count;
unsigned int frames_per_block;
vmd_frame *frame_table;
unsigned int current_frame;
int is_indeo3;
int sample_rate;
int64_t audio_sample_counter;
int skiphdr;
unsigned char vmd_header[VMD_HEADER_SIZE];
} VmdDemuxContext;
static int vmd_probe(const AVProbeData *p)
{
int w, h, sample_rate;
if (p->buf_size < 806)
return 0;
/* check if the first 2 bytes of the file contain the appropriate size
* of a VMD header chunk */
if (AV_RL16(&p->buf[0]) != VMD_HEADER_SIZE - 2)
return 0;
w = AV_RL16(&p->buf[12]);
h = AV_RL16(&p->buf[14]);
sample_rate = AV_RL16(&p->buf[804]);
if ((!w || w > 2048 || !h || h > 2048) &&
sample_rate != 22050)
return 0;
/* only return half certainty since this check is a bit sketchy */
return AVPROBE_SCORE_EXTENSION;
}
static int vmd_read_header(AVFormatContext *s)
{
VmdDemuxContext *vmd = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *st = NULL, *vst = NULL;
unsigned int toc_offset;
unsigned char *raw_frame_table;
int raw_frame_table_size;
int64_t current_offset;
int i, j, ret;
int width, height;
unsigned int total_frames;
int64_t current_audio_pts = 0;
unsigned char chunk[BYTES_PER_FRAME_RECORD];
int num, den;
int sound_buffers;
/* fetch the main header, including the 2 header length bytes */
avio_seek(pb, 0, SEEK_SET);
if (avio_read(pb, vmd->vmd_header, VMD_HEADER_SIZE) != VMD_HEADER_SIZE)
return AVERROR(EIO);
width = AV_RL16(&vmd->vmd_header[12]);
height = AV_RL16(&vmd->vmd_header[14]);
if (width && height) {
if(vmd->vmd_header[24] == 'i' && vmd->vmd_header[25] == 'v' && vmd->vmd_header[26] == '3') {
vmd->is_indeo3 = 1;
} else {
vmd->is_indeo3 = 0;
}
/* start up the decoders */
vst = avformat_new_stream(s, NULL);
if (!vst)
return AVERROR(ENOMEM);
avpriv_set_pts_info(vst, 33, 1, 10);
vmd->video_stream_index = vst->index;
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = vmd->is_indeo3 ? AV_CODEC_ID_INDEO3 : AV_CODEC_ID_VMDVIDEO;
vst->codecpar->codec_tag = 0; /* no fourcc */
vst->codecpar->width = width;
vst->codecpar->height = height;
if(vmd->is_indeo3 && vst->codecpar->width > 320){
vst->codecpar->width >>= 1;
vst->codecpar->height >>= 1;
}
if ((ret = ff_alloc_extradata(vst->codecpar, VMD_HEADER_SIZE)) < 0)
return ret;
memcpy(vst->codecpar->extradata, vmd->vmd_header, VMD_HEADER_SIZE);
}
/* if sample rate is 0, assume no audio */
vmd->sample_rate = AV_RL16(&vmd->vmd_header[804]);
if (vmd->sample_rate) {
st = avformat_new_stream(s, NULL);
if (!st)
return AVERROR(ENOMEM);
vmd->audio_stream_index = st->index;
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->codec_id = AV_CODEC_ID_VMDAUDIO;
st->codecpar->codec_tag = 0; /* no fourcc */
st->codecpar->sample_rate = vmd->sample_rate;
st->codecpar->block_align = AV_RL16(&vmd->vmd_header[806]);
if (st->codecpar->block_align & 0x8000) {
st->codecpar->bits_per_coded_sample = 16;
st->codecpar->block_align = -(st->codecpar->block_align - 0x10000);
} else {
st->codecpar->bits_per_coded_sample = 8;
}
if (vmd->vmd_header[811] & 0x80) {
st->codecpar->channels = 2;
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
} else if (vmd->vmd_header[811] & 0x2) {
/* Shivers 2 stereo audio */
/* Frame length is for 1 channel */
st->codecpar->channels = 2;
st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
st->codecpar->block_align = st->codecpar->block_align << 1;
} else {
st->codecpar->channels = 1;
st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
}
st->codecpar->bit_rate = st->codecpar->sample_rate *
st->codecpar->bits_per_coded_sample * st->codecpar->channels;
/* calculate pts */
num = st->codecpar->block_align;
den = st->codecpar->sample_rate * st->codecpar->channels;
av_reduce(&num, &den, num, den, (1UL<<31)-1);
if (vst)
avpriv_set_pts_info(vst, 33, num, den);
avpriv_set_pts_info(st, 33, num, den);
}
toc_offset = AV_RL32(&vmd->vmd_header[812]);
vmd->frame_count = AV_RL16(&vmd->vmd_header[6]);
vmd->frames_per_block = AV_RL16(&vmd->vmd_header[18]);
avio_seek(pb, toc_offset, SEEK_SET);
raw_frame_table = NULL;
vmd->frame_table = NULL;
sound_buffers = AV_RL16(&vmd->vmd_header[808]);
raw_frame_table_size = vmd->frame_count * 6;
if(vmd->frame_count * vmd->frames_per_block >= UINT_MAX / sizeof(vmd_frame) - sound_buffers){
av_log(s, AV_LOG_ERROR, "vmd->frame_count * vmd->frames_per_block too large\n");
return -1;
}
raw_frame_table = av_malloc(raw_frame_table_size);
vmd->frame_table = av_malloc_array(vmd->frame_count * vmd->frames_per_block + sound_buffers, sizeof(vmd_frame));
if (!raw_frame_table || !vmd->frame_table) {
ret = AVERROR(ENOMEM);
goto error;
}
if (avio_read(pb, raw_frame_table, raw_frame_table_size) !=
raw_frame_table_size) {
ret = AVERROR(EIO);
goto error;
}
total_frames = 0;
for (i = 0; i < vmd->frame_count; i++) {
current_offset = AV_RL32(&raw_frame_table[6 * i + 2]);
/* handle each entry in index block */
for (j = 0; j < vmd->frames_per_block; j++) {
int type;
uint32_t size;
if ((ret = avio_read(pb, chunk, BYTES_PER_FRAME_RECORD)) != BYTES_PER_FRAME_RECORD) {
av_log(s, AV_LOG_ERROR, "Failed to read frame record\n");
if (ret >= 0)
ret = AVERROR_INVALIDDATA;
goto error;
}
type = chunk[0];
size = AV_RL32(&chunk[2]);
if (size > INT_MAX / 2) {
av_log(s, AV_LOG_ERROR, "Invalid frame size\n");
ret = AVERROR_INVALIDDATA;
goto error;
}
if(!size && type != 1)
continue;
switch(type) {
case 1: /* Audio Chunk */
if (!st) break;
/* first audio chunk contains several audio buffers */
vmd->frame_table[total_frames].frame_offset = current_offset;
vmd->frame_table[total_frames].stream_index = vmd->audio_stream_index;
vmd->frame_table[total_frames].frame_size = size;
memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
vmd->frame_table[total_frames].pts = current_audio_pts;
total_frames++;
if(!current_audio_pts)
current_audio_pts += sound_buffers - 1;
else
current_audio_pts++;
break;
case 2: /* Video Chunk */
vmd->frame_table[total_frames].frame_offset = current_offset;
vmd->frame_table[total_frames].stream_index = vmd->video_stream_index;
vmd->frame_table[total_frames].frame_size = size;
memcpy(vmd->frame_table[total_frames].frame_record, chunk, BYTES_PER_FRAME_RECORD);
vmd->frame_table[total_frames].pts = i;
total_frames++;
break;
}
current_offset += size;
}
}
av_free(raw_frame_table);
vmd->current_frame = 0;
vmd->frame_count = total_frames;
return 0;
error:
av_freep(&raw_frame_table);
av_freep(&vmd->frame_table);
return ret;
}
static int vmd_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
VmdDemuxContext *vmd = s->priv_data;
AVIOContext *pb = s->pb;
int ret = 0;
vmd_frame *frame;
if (vmd->current_frame >= vmd->frame_count)
return AVERROR_EOF;
frame = &vmd->frame_table[vmd->current_frame];
/* position the stream (will probably be there already) */
avio_seek(pb, frame->frame_offset, SEEK_SET);
if(ffio_limit(pb, frame->frame_size) != frame->frame_size)
return AVERROR(EIO);
ret = av_new_packet(pkt, frame->frame_size + BYTES_PER_FRAME_RECORD);
if (ret < 0)
return ret;
pkt->pos= avio_tell(pb);
memcpy(pkt->data, frame->frame_record, BYTES_PER_FRAME_RECORD);
if(vmd->is_indeo3 && frame->frame_record[0] == 0x02)
ret = avio_read(pb, pkt->data, frame->frame_size);
else
ret = avio_read(pb, pkt->data + BYTES_PER_FRAME_RECORD,
frame->frame_size);
if (ret != frame->frame_size) {
av_packet_unref(pkt);
ret = AVERROR(EIO);
}
pkt->stream_index = frame->stream_index;
pkt->pts = frame->pts;
av_log(s, AV_LOG_DEBUG, " dispatching %s frame with %d bytes and pts %"PRId64"\n",
(frame->frame_record[0] == 0x02) ? "video" : "audio",
frame->frame_size + BYTES_PER_FRAME_RECORD,
pkt->pts);
vmd->current_frame++;
return ret;
}
static int vmd_read_close(AVFormatContext *s)
{
VmdDemuxContext *vmd = s->priv_data;
av_freep(&vmd->frame_table);
return 0;
}
AVInputFormat ff_vmd_demuxer = {
.name = "vmd",
.long_name = NULL_IF_CONFIG_SMALL("Sierra VMD"),
.priv_data_size = sizeof(VmdDemuxContext),
.read_probe = vmd_probe,
.read_header = vmd_read_header,
.read_packet = vmd_read_packet,
.read_close = vmd_read_close,
};
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