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4349 | Serge | 1 | /* |
2 | * Motion Pixels MVI Demuxer |
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3 | * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net) |
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4 | * |
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5 | * This file is part of FFmpeg. |
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6 | * |
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7 | * FFmpeg is free software; you can redistribute it and/or |
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8 | * modify it under the terms of the GNU Lesser General Public |
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9 | * License as published by the Free Software Foundation; either |
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10 | * version 2.1 of the License, or (at your option) any later version. |
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11 | * |
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12 | * FFmpeg is distributed in the hope that it will be useful, |
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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15 | * Lesser General Public License for more details. |
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16 | * |
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17 | * You should have received a copy of the GNU Lesser General Public |
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18 | * License along with FFmpeg; if not, write to the Free Software |
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19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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20 | */ |
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21 | |||
22 | #include "libavutil/channel_layout.h" |
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23 | #include "avformat.h" |
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24 | #include "internal.h" |
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25 | |||
26 | #define MVI_FRAC_BITS 10 |
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27 | |||
28 | #define MVI_AUDIO_STREAM_INDEX 0 |
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29 | #define MVI_VIDEO_STREAM_INDEX 1 |
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30 | |||
31 | typedef struct MviDemuxContext { |
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32 | unsigned int (*get_int)(AVIOContext *); |
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33 | uint32_t audio_data_size; |
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34 | uint64_t audio_size_counter; |
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35 | uint64_t audio_frame_size; |
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36 | int audio_size_left; |
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37 | int video_frame_size; |
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38 | } MviDemuxContext; |
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39 | |||
40 | static int read_header(AVFormatContext *s) |
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41 | { |
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42 | MviDemuxContext *mvi = s->priv_data; |
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43 | AVIOContext *pb = s->pb; |
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44 | AVStream *ast, *vst; |
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45 | unsigned int version, frames_count, msecs_per_frame, player_version; |
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46 | |||
47 | ast = avformat_new_stream(s, NULL); |
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48 | if (!ast) |
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49 | return AVERROR(ENOMEM); |
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50 | |||
51 | vst = avformat_new_stream(s, NULL); |
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52 | if (!vst) |
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53 | return AVERROR(ENOMEM); |
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54 | |||
55 | if (ff_alloc_extradata(vst->codec, 2)) |
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56 | return AVERROR(ENOMEM); |
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57 | |||
58 | version = avio_r8(pb); |
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59 | vst->codec->extradata[0] = avio_r8(pb); |
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60 | vst->codec->extradata[1] = avio_r8(pb); |
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61 | frames_count = avio_rl32(pb); |
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62 | msecs_per_frame = avio_rl32(pb); |
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63 | vst->codec->width = avio_rl16(pb); |
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64 | vst->codec->height = avio_rl16(pb); |
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65 | avio_r8(pb); |
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66 | ast->codec->sample_rate = avio_rl16(pb); |
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67 | mvi->audio_data_size = avio_rl32(pb); |
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68 | avio_r8(pb); |
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69 | player_version = avio_rl32(pb); |
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70 | avio_rl16(pb); |
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71 | avio_r8(pb); |
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72 | |||
73 | if (frames_count == 0 || mvi->audio_data_size == 0) |
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74 | return AVERROR_INVALIDDATA; |
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75 | |||
76 | if (version != 7 || player_version > 213) { |
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77 | av_log(s, AV_LOG_ERROR, "unhandled version (%d,%d)\n", version, player_version); |
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78 | return AVERROR_INVALIDDATA; |
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79 | } |
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80 | |||
81 | avpriv_set_pts_info(ast, 64, 1, ast->codec->sample_rate); |
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82 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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83 | ast->codec->codec_id = AV_CODEC_ID_PCM_U8; |
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84 | ast->codec->channels = 1; |
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85 | ast->codec->channel_layout = AV_CH_LAYOUT_MONO; |
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86 | ast->codec->bits_per_coded_sample = 8; |
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87 | ast->codec->bit_rate = ast->codec->sample_rate * 8; |
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88 | |||
89 | avpriv_set_pts_info(vst, 64, msecs_per_frame, 1000000); |
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90 | vst->avg_frame_rate = av_inv_q(vst->time_base); |
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91 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
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92 | vst->codec->codec_id = AV_CODEC_ID_MOTIONPIXELS; |
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93 | |||
94 | mvi->get_int = (vst->codec->width * vst->codec->height < (1 << 16)) ? avio_rl16 : avio_rl24; |
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95 | |||
96 | mvi->audio_frame_size = ((uint64_t)mvi->audio_data_size << MVI_FRAC_BITS) / frames_count; |
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97 | if (mvi->audio_frame_size <= 1 << MVI_FRAC_BITS - 1) { |
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98 | av_log(s, AV_LOG_ERROR, "Invalid audio_data_size (%d) or frames_count (%d)\n", |
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99 | mvi->audio_data_size, frames_count); |
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100 | return AVERROR_INVALIDDATA; |
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101 | } |
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102 | |||
103 | mvi->audio_size_counter = (ast->codec->sample_rate * 830 / mvi->audio_frame_size - 1) * mvi->audio_frame_size; |
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104 | mvi->audio_size_left = mvi->audio_data_size; |
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105 | |||
106 | return 0; |
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107 | } |
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108 | |||
109 | static int read_packet(AVFormatContext *s, AVPacket *pkt) |
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110 | { |
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111 | int ret, count; |
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112 | MviDemuxContext *mvi = s->priv_data; |
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113 | AVIOContext *pb = s->pb; |
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114 | |||
115 | if (mvi->video_frame_size == 0) { |
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116 | mvi->video_frame_size = (mvi->get_int)(pb); |
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117 | if (mvi->audio_size_left == 0) |
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118 | return AVERROR(EIO); |
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119 | count = (mvi->audio_size_counter + mvi->audio_frame_size + 512) >> MVI_FRAC_BITS; |
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120 | if (count > mvi->audio_size_left) |
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121 | count = mvi->audio_size_left; |
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122 | if ((ret = av_get_packet(pb, pkt, count)) < 0) |
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123 | return ret; |
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124 | pkt->stream_index = MVI_AUDIO_STREAM_INDEX; |
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125 | mvi->audio_size_left -= count; |
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126 | mvi->audio_size_counter += mvi->audio_frame_size - (count << MVI_FRAC_BITS); |
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127 | } else { |
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128 | if ((ret = av_get_packet(pb, pkt, mvi->video_frame_size)) < 0) |
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129 | return ret; |
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130 | pkt->stream_index = MVI_VIDEO_STREAM_INDEX; |
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131 | mvi->video_frame_size = 0; |
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132 | } |
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133 | return 0; |
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134 | } |
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135 | |||
136 | AVInputFormat ff_mvi_demuxer = { |
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137 | .name = "mvi", |
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138 | .long_name = NULL_IF_CONFIG_SMALL("Motion Pixels MVI"), |
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139 | .priv_data_size = sizeof(MviDemuxContext), |
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140 | .read_header = read_header, |
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141 | .read_packet = read_packet, |
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142 | .extensions = "mvi", |
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143 | };>><>>><>=>><>><>> |