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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 "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, AVFormatParameters *ap)
- {
- 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);
- vst->codec->extradata_size = 2;
- vst->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE);
- 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 = CODEC_ID_PCM_U8;
- ast->codec->channels = 1;
- 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->codec->codec_type = AVMEDIA_TYPE_VIDEO;
- vst->codec->codec_id = 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 format"),
- .priv_data_size = sizeof(MviDemuxContext),
- .read_header = read_header,
- .read_packet = read_packet,
- .extensions = "mvi"
- };
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