| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Brute Force & Ignorance (BFI) demuxer | ||
| 3 | * Copyright (c) 2008 Sisir Koppaka | ||
| 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 | /** | ||
| 23 | * @file | ||
| 24 | * @brief Brute Force & Ignorance (.bfi) file demuxer | ||
| 25 | * @author Sisir Koppaka ( sisir.koppaka at gmail dot com ) | ||
| 26 | * @see http://wiki.multimedia.cx/index.php?title=BFI | ||
| 27 | */ | ||
| 28 | |||
| 29 | #include "libavutil/channel_layout.h" | ||
| 30 | #include "libavutil/intreadwrite.h" | ||
| 31 | #include "avformat.h" | ||
| 32 | #include "demux.h" | ||
| 33 | #include "internal.h" | ||
| 34 | |||
| 35 | typedef struct BFIContext { | ||
| 36 | int nframes; | ||
| 37 | int audio_frame; | ||
| 38 | int video_frame; | ||
| 39 | int video_size; | ||
| 40 | int avflag; | ||
| 41 | } BFIContext; | ||
| 42 | |||
| 43 | 7125 | static int bfi_probe(const AVProbeData * p) | |
| 44 | { | ||
| 45 | /* Check file header */ | ||
| 46 |
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7125 | if (AV_RL32(p->buf) == MKTAG('B', 'F', '&', 'I')) |
| 47 | 1 | return AVPROBE_SCORE_MAX; | |
| 48 | else | ||
| 49 | 7124 | return 0; | |
| 50 | } | ||
| 51 | |||
| 52 | 1 | static int bfi_read_header(AVFormatContext * s) | |
| 53 | { | ||
| 54 | 1 | BFIContext *bfi = s->priv_data; | |
| 55 | 1 | AVIOContext *pb = s->pb; | |
| 56 | AVStream *vstream; | ||
| 57 | AVStream *astream; | ||
| 58 | int ret, fps, chunk_header; | ||
| 59 | |||
| 60 | /* Initialize the video codec... */ | ||
| 61 | 1 | vstream = avformat_new_stream(s, NULL); | |
| 62 |
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1 | if (!vstream) |
| 63 | ✗ | return AVERROR(ENOMEM); | |
| 64 | |||
| 65 | /* Initialize the audio codec... */ | ||
| 66 | 1 | astream = avformat_new_stream(s, NULL); | |
| 67 |
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1 | if (!astream) |
| 68 | ✗ | return AVERROR(ENOMEM); | |
| 69 | |||
| 70 | /* Set the total number of frames. */ | ||
| 71 | 1 | avio_skip(pb, 8); | |
| 72 | 1 | chunk_header = avio_rl32(pb); | |
| 73 |
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1 | if (chunk_header < 3) |
| 74 | ✗ | return AVERROR_INVALIDDATA; | |
| 75 | |||
| 76 | 1 | bfi->nframes = avio_rl32(pb); | |
| 77 |
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1 | if (bfi->nframes < 0) |
| 78 | ✗ | return AVERROR_INVALIDDATA; | |
| 79 | 1 | avio_rl32(pb); | |
| 80 | 1 | avio_rl32(pb); | |
| 81 | 1 | avio_rl32(pb); | |
| 82 | 1 | fps = avio_rl32(pb); | |
| 83 | 1 | avio_skip(pb, 12); | |
| 84 | 1 | vstream->codecpar->width = avio_rl32(pb); | |
| 85 | 1 | vstream->codecpar->height = avio_rl32(pb); | |
| 86 | |||
| 87 | /*Load the palette to extradata */ | ||
| 88 | 1 | avio_skip(pb, 8); | |
| 89 | 1 | ret = ff_get_extradata(s, vstream->codecpar, pb, 768); | |
| 90 |
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1 | if (ret < 0) |
| 91 | ✗ | return ret; | |
| 92 | |||
| 93 | 1 | astream->codecpar->sample_rate = avio_rl32(pb); | |
| 94 |
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1 | if (astream->codecpar->sample_rate <= 0) { |
| 95 | ✗ | av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", astream->codecpar->sample_rate); | |
| 96 | ✗ | return AVERROR_INVALIDDATA; | |
| 97 | } | ||
| 98 | |||
| 99 | /* Set up the video codec... */ | ||
| 100 | 1 | avpriv_set_pts_info(vstream, 32, 1, fps); | |
| 101 | 1 | vstream->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; | |
| 102 | 1 | vstream->codecpar->codec_id = AV_CODEC_ID_BFI; | |
| 103 | 1 | vstream->codecpar->format = AV_PIX_FMT_PAL8; | |
| 104 | 1 | vstream->nb_frames = | |
| 105 | 1 | vstream->duration = bfi->nframes; | |
| 106 | |||
| 107 | /* Set up the audio codec now... */ | ||
| 108 | 1 | astream->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 109 | 1 | astream->codecpar->codec_id = AV_CODEC_ID_PCM_U8; | |
| 110 | 1 | astream->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| 111 | 1 | astream->codecpar->bits_per_coded_sample = 8; | |
| 112 | 1 | astream->codecpar->bit_rate = | |
| 113 | 1 | (int64_t)astream->codecpar->sample_rate * astream->codecpar->bits_per_coded_sample; | |
| 114 | 1 | avio_seek(pb, chunk_header - 3, SEEK_SET); | |
| 115 | 1 | avpriv_set_pts_info(astream, 64, 1, astream->codecpar->sample_rate); | |
| 116 | 1 | return 0; | |
| 117 | } | ||
| 118 | |||
| 119 | |||
| 120 | 115 | static int bfi_read_packet(AVFormatContext * s, AVPacket * pkt) | |
| 121 | { | ||
| 122 | 115 | BFIContext *bfi = s->priv_data; | |
| 123 | 115 | AVIOContext *pb = s->pb; | |
| 124 | 115 | int ret, audio_offset, video_offset, chunk_size, audio_size = 0; | |
| 125 |
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115 | if (bfi->nframes == 0 || avio_feof(pb)) { |
| 126 | 1 | return AVERROR_EOF; | |
| 127 | } | ||
| 128 | |||
| 129 | /* If all previous chunks were completely read, then find a new one... */ | ||
| 130 |
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114 | if (!bfi->avflag) { |
| 131 | 57 | uint32_t state = 0; | |
| 132 |
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288 | while(state != MKTAG('S','A','V','I')){ |
| 133 |
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231 | if (avio_feof(pb)) |
| 134 | ✗ | return AVERROR(EIO); | |
| 135 | 231 | state = 256*state + avio_r8(pb); | |
| 136 | } | ||
| 137 | /* Now that the chunk's location is confirmed, we proceed... */ | ||
| 138 | 57 | chunk_size = avio_rl32(pb); | |
| 139 | 57 | avio_rl32(pb); | |
| 140 | 57 | audio_offset = avio_rl32(pb); | |
| 141 | 57 | avio_rl32(pb); | |
| 142 | 57 | video_offset = avio_rl32(pb); | |
| 143 |
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57 | if (audio_offset < 0 || video_offset < audio_offset || chunk_size < video_offset) { |
| 144 | ✗ | av_log(s, AV_LOG_ERROR, "Invalid audio/video offsets or chunk size\n"); | |
| 145 | ✗ | return AVERROR_INVALIDDATA; | |
| 146 | } | ||
| 147 | 57 | audio_size = video_offset - audio_offset; | |
| 148 | 57 | bfi->video_size = chunk_size - video_offset; | |
| 149 | |||
| 150 | //Tossing an audio packet at the audio decoder. | ||
| 151 | 57 | ret = av_get_packet(pb, pkt, audio_size); | |
| 152 |
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57 | if (ret < 0) |
| 153 | ✗ | return ret; | |
| 154 | |||
| 155 | 57 | pkt->pts = bfi->audio_frame; | |
| 156 | 57 | bfi->audio_frame += ret; | |
| 157 |
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57 | } else if (bfi->video_size > 0) { |
| 158 | |||
| 159 | //Tossing a video packet at the video decoder. | ||
| 160 | 57 | ret = av_get_packet(pb, pkt, bfi->video_size); | |
| 161 |
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57 | if (ret < 0) |
| 162 | ✗ | return ret; | |
| 163 | |||
| 164 | 57 | pkt->pts = bfi->video_frame; | |
| 165 | 57 | bfi->video_frame += ret / bfi->video_size; | |
| 166 | |||
| 167 | /* One less frame to read. A cursory decrement. */ | ||
| 168 | 57 | bfi->nframes--; | |
| 169 | } else { | ||
| 170 | /* Empty video packet */ | ||
| 171 | ✗ | ret = AVERROR(EAGAIN); | |
| 172 | } | ||
| 173 | |||
| 174 | 114 | bfi->avflag = !bfi->avflag; | |
| 175 | 114 | pkt->stream_index = bfi->avflag; | |
| 176 | 114 | return ret; | |
| 177 | } | ||
| 178 | |||
| 179 | const FFInputFormat ff_bfi_demuxer = { | ||
| 180 | .p.name = "bfi", | ||
| 181 | .p.long_name = NULL_IF_CONFIG_SMALL("Brute Force & Ignorance"), | ||
| 182 | .priv_data_size = sizeof(BFIContext), | ||
| 183 | .read_probe = bfi_probe, | ||
| 184 | .read_header = bfi_read_header, | ||
| 185 | .read_packet = bfi_read_packet, | ||
| 186 | }; | ||
| 187 |