yading@11: /* yading@11: * Motion Pixels MVI Demuxer yading@11: * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) yading@11: * yading@11: * This file is part of FFmpeg. yading@11: * yading@11: * FFmpeg is free software; you can redistribute it and/or yading@11: * modify it under the terms of the GNU Lesser General Public yading@11: * License as published by the Free Software Foundation; either yading@11: * version 2.1 of the License, or (at your option) any later version. yading@11: * yading@11: * FFmpeg is distributed in the hope that it will be useful, yading@11: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@11: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@11: * Lesser General Public License for more details. yading@11: * yading@11: * You should have received a copy of the GNU Lesser General Public yading@11: * License along with FFmpeg; if not, write to the Free Software yading@11: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@11: */ yading@11: yading@11: #include "libavutil/channel_layout.h" yading@11: #include "avformat.h" yading@11: #include "internal.h" yading@11: yading@11: #define MVI_FRAC_BITS 10 yading@11: yading@11: #define MVI_AUDIO_STREAM_INDEX 0 yading@11: #define MVI_VIDEO_STREAM_INDEX 1 yading@11: yading@11: typedef struct MviDemuxContext { yading@11: unsigned int (*get_int)(AVIOContext *); yading@11: uint32_t audio_data_size; yading@11: uint64_t audio_size_counter; yading@11: uint64_t audio_frame_size; yading@11: int audio_size_left; yading@11: int video_frame_size; yading@11: } MviDemuxContext; yading@11: yading@11: static int read_header(AVFormatContext *s) yading@11: { yading@11: MviDemuxContext *mvi = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: AVStream *ast, *vst; yading@11: unsigned int version, frames_count, msecs_per_frame, player_version; yading@11: yading@11: ast = avformat_new_stream(s, NULL); yading@11: if (!ast) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: vst = avformat_new_stream(s, NULL); yading@11: if (!vst) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: vst->codec->extradata_size = 2; yading@11: vst->codec->extradata = av_mallocz(2 + FF_INPUT_BUFFER_PADDING_SIZE); yading@11: if (!vst->codec->extradata) yading@11: return AVERROR(ENOMEM); yading@11: yading@11: version = avio_r8(pb); yading@11: vst->codec->extradata[0] = avio_r8(pb); yading@11: vst->codec->extradata[1] = avio_r8(pb); yading@11: frames_count = avio_rl32(pb); yading@11: msecs_per_frame = avio_rl32(pb); yading@11: vst->codec->width = avio_rl16(pb); yading@11: vst->codec->height = avio_rl16(pb); yading@11: avio_r8(pb); yading@11: ast->codec->sample_rate = avio_rl16(pb); yading@11: mvi->audio_data_size = avio_rl32(pb); yading@11: avio_r8(pb); yading@11: player_version = avio_rl32(pb); yading@11: avio_rl16(pb); yading@11: avio_r8(pb); yading@11: yading@11: if (frames_count == 0 || mvi->audio_data_size == 0) yading@11: return AVERROR_INVALIDDATA; yading@11: yading@11: if (version != 7 || player_version > 213) { yading@11: av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: yading@11: avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); yading@11: ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; yading@11: ast->codec->codec_id = AV_CODEC_ID_PCM_U8; yading@11: ast->codec->channels = 1; yading@11: ast->codec->channel_layout = AV_CH_LAYOUT_MONO; yading@11: ast->codec->bits_per_coded_sample = 8; yading@11: ast->codec->bit_rate = ast->codec->sample_rate * 8; yading@11: yading@11: avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); yading@11: vst->avg_frame_rate = av_inv_q(vst->time_base); yading@11: vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; yading@11: vst->codec->codec_id = AV_CODEC_ID_MOTIONPIXELS; yading@11: yading@11: mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24; yading@11: yading@11: mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count; yading@11: if (!mvi->audio_frame_size) { yading@11: av_log(s, AV_LOG_ERROR, "audio_frame_size is 0\n"); yading@11: return AVERROR_INVALIDDATA; yading@11: } yading@11: mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size; yading@11: mvi->audio_size_left = mvi->audio_data_size; yading@11: yading@11: return 0; yading@11: } yading@11: yading@11: static int read_packet(AVFormatContext *s, AVPacket *pkt) yading@11: { yading@11: int ret, count; yading@11: MviDemuxContext *mvi = s->priv_data; yading@11: AVIOContext *pb = s->pb; yading@11: yading@11: if (mvi->video_frame_size == 0) { yading@11: mvi->video_frame_size = (mvi->get_int)(pb); yading@11: if (mvi->audio_size_left == 0) yading@11: return AVERROR(EIO); yading@11: count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS; yading@11: if (count > mvi->audio_size_left) yading@11: count = mvi->audio_size_left; yading@11: if ((ret = av_get_packet(pb, pkt, count)) < 0) yading@11: return ret; yading@11: pkt->stream_index = MVI_AUDIO_STREAM_INDEX; yading@11: mvi->audio_size_left -= count; yading@11: mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS); yading@11: } else { yading@11: if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0) yading@11: return ret; yading@11: pkt->stream_index = MVI_VIDEO_STREAM_INDEX; yading@11: mvi->video_frame_size = 0; yading@11: } yading@11: return 0; yading@11: } yading@11: yading@11: AVInputFormat ff_mvi_demuxer = { yading@11: .name = "mvi", yading@11: .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"), yading@11: .priv_data_size = sizeof(MviDemuxContext), yading@11: .read_header = read_header, yading@11: .read_packet = read_packet, yading@11: .extensions = "mvi", yading@11: };