diff options
Diffstat (limited to 'ffmpeg/libavformat/mvi.c')
| -rw-r--r-- | ffmpeg/libavformat/mvi.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/ffmpeg/libavformat/mvi.c b/ffmpeg/libavformat/mvi.c new file mode 100644 index 0000000..953c182 --- /dev/null +++ b/ffmpeg/libavformat/mvi.c @@ -0,0 +1,143 @@ +/* + * 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 "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); + if (!vst->codec->extradata) + return AVERROR(ENOMEM); + + 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) { + av_log(s, AV_LOG_ERROR, "audio_frame_size is 0\n"); + 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", +}; |