144 lines
4.9 KiB
C
144 lines
4.9 KiB
C
/*
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* Motion Pixels MVI Demuxer
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* Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "libavutil/channel_layout.h"
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#include "avformat.h"
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#include "internal.h"
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#define MVI_FRAC_BITS 10
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#define MVI_AUDIO_STREAM_INDEX 0
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#define MVI_VIDEO_STREAM_INDEX 1
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typedef struct MviDemuxContext {
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unsigned int (*get_int)(AVIOContext *);
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uint32_t audio_data_size;
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uint64_t audio_size_counter;
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uint64_t audio_frame_size;
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int audio_size_left;
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int video_frame_size;
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} MviDemuxContext;
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static int read_header(AVFormatContext *s)
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{
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MviDemuxContext *mvi = s->priv_data;
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AVIOContext *pb = s->pb;
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AVStream *ast, *vst;
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unsigned int version, frames_count, msecs_per_frame, player_version;
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ast = avformat_new_stream(s, NULL);
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if (!ast)
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return AVERROR(ENOMEM);
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vst = avformat_new_stream(s, NULL);
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if (!vst)
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return AVERROR(ENOMEM);
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if (ff_alloc_extradata(vst->codec, 2))
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return AVERROR(ENOMEM);
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version = avio_r8(pb);
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vst->codec->extradata[0] = avio_r8(pb);
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vst->codec->extradata[1] = avio_r8(pb);
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frames_count = avio_rl32(pb);
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msecs_per_frame = avio_rl32(pb);
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vst->codec->width = avio_rl16(pb);
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vst->codec->height = avio_rl16(pb);
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avio_r8(pb);
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ast->codec->sample_rate = avio_rl16(pb);
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mvi->audio_data_size = avio_rl32(pb);
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avio_r8(pb);
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player_version = avio_rl32(pb);
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avio_rl16(pb);
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avio_r8(pb);
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if (frames_count == 0 || mvi->audio_data_size == 0)
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return AVERROR_INVALIDDATA;
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if (version != 7 || player_version > 213) {
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av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version);
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return AVERROR_INVALIDDATA;
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}
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avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate);
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ast->codec->codec_type = AVMEDIA_TYPE_AUDIO;
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ast->codec->codec_id = AV_CODEC_ID_PCM_U8;
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ast->codec->channels = 1;
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ast->codec->channel_layout = AV_CH_LAYOUT_MONO;
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ast->codec->bits_per_coded_sample = 8;
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ast->codec->bit_rate = ast->codec->sample_rate * 8;
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avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000);
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vst->avg_frame_rate = av_inv_q(vst->time_base);
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vst->codec->codec_type = AVMEDIA_TYPE_VIDEO;
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vst->codec->codec_id = AV_CODEC_ID_MOTIONPIXELS;
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mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24;
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mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count;
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if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) {
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av_log(s, AV_LOG_ERROR, "Invalid audio_data_size (%d) or frames_count (%d)\n",
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mvi->audio_data_size, frames_count);
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return AVERROR_INVALIDDATA;
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}
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mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size;
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mvi->audio_size_left = mvi->audio_data_size;
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return 0;
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}
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static int read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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int ret, count;
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MviDemuxContext *mvi = s->priv_data;
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AVIOContext *pb = s->pb;
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if (mvi->video_frame_size == 0) {
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mvi->video_frame_size = (mvi->get_int)(pb);
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if (mvi->audio_size_left == 0)
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return AVERROR(EIO);
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count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS;
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if (count > mvi->audio_size_left)
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count = mvi->audio_size_left;
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if ((ret = av_get_packet(pb, pkt, count)) < 0)
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return ret;
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pkt->stream_index = MVI_AUDIO_STREAM_INDEX;
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mvi->audio_size_left -= count;
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mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS);
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} else {
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if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0)
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return ret;
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pkt->stream_index = MVI_VIDEO_STREAM_INDEX;
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mvi->video_frame_size = 0;
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}
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return 0;
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}
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AVInputFormat ff_mvi_demuxer = {
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.name = "mvi",
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.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"),
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.priv_data_size = sizeof(MviDemuxContext),
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.read_header = read_header,
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.read_packet = read_packet,
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.extensions = "mvi",
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};
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