FFmpeg/libavformat/mvi.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

148 lines
5.0 KiB
C

/*
* Motion Pixels MVI Demuxer
* Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
*
* 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
*/
#include <inttypes.h>
#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "internal.h"
#define MVI_FRAC_BITS 10
#define MVI_AUDIO_STREAM_INDEX 0
#define MVI_VIDEO_STREAM_INDEX 1
typedef struct MviDemuxContext {
unsigned int (*get_int)(AVIOContext *);
uint32_t audio_data_size;
uint64_t audio_size_counter;
uint64_t audio_frame_size;
int audio_size_left;
int video_frame_size;
} MviDemuxContext;
static int read_header(AVFormatContext *s)
{
MviDemuxContext *mvi = s->priv_data;
AVIOContext *pb = s->pb;
AVStream *ast, *vst;
unsigned int version, frames_count, msecs_per_frame, player_version;
int ret;
ast = avformat_new_stream(s, NULL);
if (!ast)
return AVERROR(ENOMEM);
vst = avformat_new_stream(s, NULL);
if (!vst)
return AVERROR(ENOMEM);
if ((ret = ff_alloc_extradata(vst->codecpar, 2)) < 0)
return ret;
version = avio_r8(pb);
vst->codecpar->extradata[0] = avio_r8(pb);
vst->codecpar->extradata[1] = avio_r8(pb);
frames_count = avio_rl32(pb);
msecs_per_frame = avio_rl32(pb);
vst->codecpar->width = avio_rl16(pb);
vst->codecpar->height = avio_rl16(pb);
avio_r8(pb);
ast->codecpar->sample_rate = avio_rl16(pb);
mvi->audio_data_size = avio_rl32(pb);
avio_r8(pb);
player_version = avio_rl32(pb);
avio_rl16(pb);
avio_r8(pb);
if (frames_count == 0 || mvi->audio_data_size == 0)
return AVERROR_INVALIDDATA;
if (version != 7 || player_version > 213) {
av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
return AVERROR_INVALIDDATA;
}
avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate);
ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8;
ast->codecpar->channels = 1;
ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
ast->codecpar->bits_per_coded_sample = 8;
ast->codecpar->bit_rate = ast->codecpar->sample_rate * 8;
avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
vst->avg_frame_rate = av_inv_q(vst->time_base);
vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS;
mvi->get_int = (vst->codecpar->width * vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24;
mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
av_log(s, AV_LOG_ERROR,
"Invalid audio_data_size (%"PRIu32") or frames_count (%u)\n",
mvi->audio_data_size, frames_count);
return AVERROR_INVALIDDATA;
}
mvi->audio_size_counter = (ast->codecpar->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
mvi->audio_size_left = mvi->audio_data_size;
return 0;
}
static int read_packet(AVFormatContext *s, AVPacket *pkt)
{
int ret, count;
MviDemuxContext *mvi = s->priv_data;
AVIOContext *pb = s->pb;
if (mvi->video_frame_size == 0) {
mvi->video_frame_size = (mvi->get_int)(pb);
if (mvi->audio_size_left == 0)
return AVERROR(EIO);
count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
if (count > mvi->audio_size_left)
count = mvi->audio_size_left;
if ((ret = av_get_packet(pb, pkt, count)) < 0)
return ret;
pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
mvi->audio_size_left -= count;
mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
} else {
if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
return ret;
pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
mvi->video_frame_size = 0;
}
return 0;
}
AVInputFormat ff_mvi_demuxer = {
.name = "mvi",
.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
.priv_data_size = sizeof(MviDemuxContext),
.read_header = read_header,
.read_packet = read_packet,
.extensions = "mvi",
};