| 1 | /* |
| 2 | * Motion Pixels MVI Demuxer |
| 3 | * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include <inttypes.h> |
| 23 | |
| 24 | #include "libavutil/channel_layout.h" |
| 25 | #include "avformat.h" |
| 26 | #include "internal.h" |
| 27 | |
| 28 | #define MVI_FRAC_BITS 10 |
| 29 | |
| 30 | #define MVI_AUDIO_STREAM_INDEX 0 |
| 31 | #define MVI_VIDEO_STREAM_INDEX 1 |
| 32 | |
| 33 | typedef struct MviDemuxContext { |
| 34 | unsigned int (*get_int)(AVIOContext *); |
| 35 | uint32_t audio_data_size; |
| 36 | uint64_t audio_size_counter; |
| 37 | uint64_t audio_frame_size; |
| 38 | int audio_size_left; |
| 39 | int video_frame_size; |
| 40 | } MviDemuxContext; |
| 41 | |
| 42 | static int read_header(AVFormatContext *s) |
| 43 | { |
| 44 | MviDemuxContext *mvi = s->priv_data; |
| 45 | AVIOContext *pb = s->pb; |
| 46 | AVStream *ast, *vst; |
| 47 | unsigned int version, frames_count, msecs_per_frame, player_version; |
| 48 | |
| 49 | ast = avformat_new_stream(s, NULL); |
| 50 | if (!ast) |
| 51 | return AVERROR(ENOMEM); |
| 52 | |
| 53 | vst = avformat_new_stream(s, NULL); |
| 54 | if (!vst) |
| 55 | return AVERROR(ENOMEM); |
| 56 | |
| 57 | if (ff_alloc_extradata(vst->codec, 2)) |
| 58 | return AVERROR(ENOMEM); |
| 59 | |
| 60 | version = avio_r8(pb); |
| 61 | vst->codec->extradata[0] = avio_r8(pb); |
| 62 | vst->codec->extradata[1] = avio_r8(pb); |
| 63 | frames_count = avio_rl32(pb); |
| 64 | msecs_per_frame = avio_rl32(pb); |
| 65 | vst->codec->width = avio_rl16(pb); |
| 66 | vst->codec->height = avio_rl16(pb); |
| 67 | avio_r8(pb); |
| 68 | ast->codec->sample_rate = avio_rl16(pb); |
| 69 | mvi->audio_data_size = avio_rl32(pb); |
| 70 | avio_r8(pb); |
| 71 | player_version = avio_rl32(pb); |
| 72 | avio_rl16(pb); |
| 73 | avio_r8(pb); |
| 74 | |
| 75 | if (frames_count == 0 || mvi->audio_data_size == 0) |
| 76 | return AVERROR_INVALIDDATA; |
| 77 | |
| 78 | if (version != 7 || player_version > 213) { |
| 79 | av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version); |
| 80 | return AVERROR_INVALIDDATA; |
| 81 | } |
| 82 | |
| 83 | avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
| 84 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 85 | ast->codec->codec_id = AV_CODEC_ID_PCM_U8; |
| 86 | ast->codec->channels = 1; |
| 87 | ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
| 88 | ast->codec->bits_per_coded_sample = 8; |
| 89 | ast->codec->bit_rate = ast->codec->sample_rate * 8; |
| 90 | |
| 91 | avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); |
| 92 | vst->avg_frame_rate = av_inv_q(vst->time_base); |
| 93 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 94 | vst->codec->codec_id = AV_CODEC_ID_MOTIONPIXELS; |
| 95 | |
| 96 | mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24; |
| 97 | |
| 98 | mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count; |
| 99 | if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) { |
| 100 | av_log(s, AV_LOG_ERROR, |
| 101 | "Invalid audio_data_size (%"PRIu32") or frames_count (%u)\n", |
| 102 | mvi->audio_data_size, frames_count); |
| 103 | return AVERROR_INVALIDDATA; |
| 104 | } |
| 105 | |
| 106 | mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size; |
| 107 | mvi->audio_size_left = mvi->audio_data_size; |
| 108 | |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
| 113 | { |
| 114 | int ret, count; |
| 115 | MviDemuxContext *mvi = s->priv_data; |
| 116 | AVIOContext *pb = s->pb; |
| 117 | |
| 118 | if (mvi->video_frame_size == 0) { |
| 119 | mvi->video_frame_size = (mvi->get_int)(pb); |
| 120 | if (mvi->audio_size_left == 0) |
| 121 | return AVERROR(EIO); |
| 122 | count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS; |
| 123 | if (count > mvi->audio_size_left) |
| 124 | count = mvi->audio_size_left; |
| 125 | if ((ret = av_get_packet(pb, pkt, count)) < 0) |
| 126 | return ret; |
| 127 | pkt->stream_index = MVI_AUDIO_STREAM_INDEX; |
| 128 | mvi->audio_size_left -= count; |
| 129 | mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS); |
| 130 | } else { |
| 131 | if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0) |
| 132 | return ret; |
| 133 | pkt->stream_index = MVI_VIDEO_STREAM_INDEX; |
| 134 | mvi->video_frame_size = 0; |
| 135 | } |
| 136 | return 0; |
| 137 | } |
| 138 | |
| 139 | AVInputFormat ff_mvi_demuxer = { |
| 140 | .name = "mvi", |
| 141 | .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"), |
| 142 | .priv_data_size = sizeof(MviDemuxContext), |
| 143 | .read_header = read_header, |
| 144 | .read_packet = read_packet, |
| 145 | .extensions = "mvi", |
| 146 | }; |