/* * Motion Pixels MVI Demuxer * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; 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; 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 = 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 (%"PRIu32") or frames_count (%u)\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", };