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/* |
* 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 "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; |
|
ast = avformat_new_stream(s, NULL); |
if (!ast) |
return AVERROR(ENOMEM); |
|
vst = avformat_new_stream(s, NULL); |
if (!vst) |
return AVERROR(ENOMEM); |
|
if (ff_alloc_extradata(vst->codec, 2)) |
return AVERROR(ENOMEM); |
|
version = avio_r8(pb); |
vst->codec->extradata[0] = avio_r8(pb); |
vst->codec->extradata[1] = avio_r8(pb); |
frames_count = avio_rl32(pb); |
msecs_per_frame = avio_rl32(pb); |
vst->codec->width = avio_rl16(pb); |
vst->codec->height = avio_rl16(pb); |
avio_r8(pb); |
ast->codec->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->codec->sample_rate); |
ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
ast->codec->codec_id = AV_CODEC_ID_PCM_U8; |
ast->codec->channels = 1; |
ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
ast->codec->bits_per_coded_sample = 8; |
ast->codec->bit_rate = ast->codec->sample_rate * 8; |
|
avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); |
vst->avg_frame_rate = av_inv_q(vst->time_base); |
vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
vst->codec->codec_id = AV_CODEC_ID_MOTIONPIXELS; |
|
mvi->get_int = (vst->codec->width * vst->codec->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 (%d) or frames_count (%d)\n", |
mvi->audio_data_size, frames_count); |
return AVERROR_INVALIDDATA; |
} |
|
mvi->audio_size_counter = (ast->codec->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", |
}; |