| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "demux.h" | ||
| 27 | #include "internal.h" | ||
| 28 | |||
| 29 | #define MVI_FRAC_BITS 10 | ||
| 30 | |||
| 31 | #define MVI_AUDIO_STREAM_INDEX 0 | ||
| 32 | #define MVI_VIDEO_STREAM_INDEX 1 | ||
| 33 | |||
| 34 | typedef struct MviDemuxContext { | ||
| 35 | unsigned int (*get_int)(AVIOContext *); | ||
| 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 | 1 | static int read_header(AVFormatContext *s) | |
| 43 | { | ||
| 44 | 1 | MviDemuxContext *mvi = s->priv_data; | |
| 45 | 1 | AVIOContext *pb = s->pb; | |
| 46 | AVStream *ast, *vst; | ||
| 47 | unsigned int version, frames_count, msecs_per_frame, player_version; | ||
| 48 | int ret; | ||
| 49 | int audio_data_size; | ||
| 50 | |||
| 51 | 1 | ast = avformat_new_stream(s, NULL); | |
| 52 |
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1 | if (!ast) |
| 53 | ✗ | return AVERROR(ENOMEM); | |
| 54 | |||
| 55 | 1 | vst = avformat_new_stream(s, NULL); | |
| 56 |
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1 | if (!vst) |
| 57 | ✗ | return AVERROR(ENOMEM); | |
| 58 | |||
| 59 |
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1 | if ((ret = ff_alloc_extradata(vst->codecpar, 2)) < 0) |
| 60 | ✗ | return ret; | |
| 61 | |||
| 62 | 1 | version = avio_r8(pb); | |
| 63 | 1 | vst->codecpar->extradata[0] = avio_r8(pb); | |
| 64 | 1 | vst->codecpar->extradata[1] = avio_r8(pb); | |
| 65 | 1 | frames_count = avio_rl32(pb); | |
| 66 | 1 | msecs_per_frame = avio_rl32(pb); | |
| 67 | 1 | vst->codecpar->width = avio_rl16(pb); | |
| 68 | 1 | vst->codecpar->height = avio_rl16(pb); | |
| 69 | 1 | avio_r8(pb); | |
| 70 | 1 | ast->codecpar->sample_rate = avio_rl16(pb); | |
| 71 | 1 | audio_data_size = avio_rl32(pb); | |
| 72 | 1 | avio_r8(pb); | |
| 73 | 1 | player_version = avio_rl32(pb); | |
| 74 | 1 | avio_rl16(pb); | |
| 75 | 1 | avio_r8(pb); | |
| 76 | |||
| 77 |
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1 | if (frames_count == 0 || audio_data_size <= 0) |
| 78 | ✗ | return AVERROR_INVALIDDATA; | |
| 79 | |||
| 80 |
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1 | if (version != 7 || player_version > 213) { |
| 81 | ✗ | av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version); | |
| 82 | ✗ | return AVERROR_INVALIDDATA; | |
| 83 | } | ||
| 84 | |||
| 85 | 1 | avpriv_set_pts_info(ast, 64, 1, ast->codecpar->sample_rate); | |
| 86 | 1 | ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 87 | 1 | ast->codecpar->codec_id = AV_CODEC_ID_PCM_U8; | |
| 88 | 1 | ast->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| 89 | 1 | ast->codecpar->bits_per_coded_sample = 8; | |
| 90 | 1 | ast->codecpar->bit_rate = ast->codecpar->sample_rate * 8; | |
| 91 | |||
| 92 | 1 | avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); | |
| 93 | 1 | vst->avg_frame_rate = av_inv_q(vst->time_base); | |
| 94 | 1 | vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 95 | 1 | vst->codecpar->codec_id = AV_CODEC_ID_MOTIONPIXELS; | |
| 96 | |||
| 97 |
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1 | mvi->get_int = (vst->codecpar->width * (int64_t)vst->codecpar->height < (1 << 16)) ? avio_rl16 : avio_rl24; |
| 98 | |||
| 99 | 1 | mvi->audio_frame_size = ((uint64_t)audio_data_size << MVI_FRAC_BITS) / frames_count; | |
| 100 |
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1 | if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) { |
| 101 | ✗ | av_log(s, AV_LOG_ERROR, | |
| 102 | "Invalid audio_data_size (%d) or frames_count (%u)\n", | ||
| 103 | audio_data_size, frames_count); | ||
| 104 | ✗ | return AVERROR_INVALIDDATA; | |
| 105 | } | ||
| 106 | |||
| 107 | 1 | mvi->audio_size_counter = (ast->codecpar->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size; | |
| 108 | 1 | mvi->audio_size_left = audio_data_size; | |
| 109 | |||
| 110 | 1 | return 0; | |
| 111 | } | ||
| 112 | |||
| 113 | 225 | static int read_packet(AVFormatContext *s, AVPacket *pkt) | |
| 114 | { | ||
| 115 | int ret, count; | ||
| 116 | 225 | MviDemuxContext *mvi = s->priv_data; | |
| 117 | 225 | AVIOContext *pb = s->pb; | |
| 118 | |||
| 119 |
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225 | if (mvi->video_frame_size == 0) { |
| 120 | 113 | mvi->video_frame_size = (mvi->get_int)(pb); | |
| 121 |
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113 | if (mvi->audio_size_left == 0) |
| 122 | ✗ | return AVERROR(EIO); | |
| 123 |
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113 | if (mvi->audio_size_counter + 512 > UINT64_MAX - mvi->audio_frame_size || |
| 124 |
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113 | mvi->audio_size_counter + 512 + mvi->audio_frame_size >= ((uint64_t)INT32_MAX) << MVI_FRAC_BITS) |
| 125 | ✗ | return AVERROR_INVALIDDATA; | |
| 126 | |||
| 127 | 113 | count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS; | |
| 128 |
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113 | if (count > mvi->audio_size_left) |
| 129 | ✗ | count = mvi->audio_size_left; | |
| 130 |
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113 | if ((int64_t)count << MVI_FRAC_BITS > INT_MAX) |
| 131 | ✗ | return AVERROR_INVALIDDATA; | |
| 132 |
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113 | if ((ret = av_get_packet(pb, pkt, count)) < 0) |
| 133 | 1 | return ret; | |
| 134 | 112 | pkt->stream_index = MVI_AUDIO_STREAM_INDEX; | |
| 135 | 112 | mvi->audio_size_left -= count; | |
| 136 | 112 | mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS); | |
| 137 | } else { | ||
| 138 |
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112 | if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0) |
| 139 | ✗ | return ret; | |
| 140 | 112 | pkt->stream_index = MVI_VIDEO_STREAM_INDEX; | |
| 141 | 112 | mvi->video_frame_size = 0; | |
| 142 | } | ||
| 143 | 224 | return 0; | |
| 144 | } | ||
| 145 | |||
| 146 | const FFInputFormat ff_mvi_demuxer = { | ||
| 147 | .p.name = "mvi", | ||
| 148 | .p.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"), | ||
| 149 | .p.extensions = "mvi", | ||
| 150 | .priv_data_size = sizeof(MviDemuxContext), | ||
| 151 | .read_header = read_header, | ||
| 152 | .read_packet = read_packet, | ||
| 153 | }; | ||
| 154 |