| /* |
| * 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 <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; |
| int ret; |
| |
| ast = avformat_new_stream(s, NULL); |
| if (!ast) |
| return AVERROR(ENOMEM); |
| |
| vst = avformat_new_stream(s, NULL); |
| if (!vst) |
| return AVERROR(ENOMEM); |
| |
| if ((ret = ff_alloc_extradata(vst->codecpar, 2)) < 0) |
| return ret; |
| |
| version = avio_r8(pb); |
| vst->codecpar->extradata[0] = avio_r8(pb); |
| vst->codecpar->extradata[1] = avio_r8(pb); |
| frames_count = avio_rl32(pb); |
| msecs_per_frame = avio_rl32(pb); |
| vst->codecpar->width = avio_rl16(pb); |
| vst->codecpar->height = avio_rl16(pb); |
| avio_r8(pb); |
| ast->codecpar->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->codecpar->sample_rate); |
| ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
| ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; |
| ast->codecpar->channels = 1; |
| ast->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
| ast->codecpar->bits_per_coded_sample = 8; |
| ast->codecpar->bit_rate = ast->codecpar->sample_rate * 8; |
| |
| avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); |
| vst->avg_frame_rate = av_inv_q(vst->time_base); |
| vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
| vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS; |
| |
| mvi->get_int = (vst->codecpar->width * vst->codecpar->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->codecpar->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 ((int64_t)count << MVI_FRAC_BITS > INT_MAX) |
| return AVERROR_INVALIDDATA; |
| 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", |
| }; |