| 1 | /* |
| 2 | * PMP demuxer. |
| 3 | * Copyright (c) 2011 Reimar Döffinger |
| 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 "libavutil/intreadwrite.h" |
| 23 | #include "avformat.h" |
| 24 | #include "internal.h" |
| 25 | |
| 26 | typedef struct { |
| 27 | int cur_stream; |
| 28 | int num_streams; |
| 29 | int audio_packets; |
| 30 | int current_packet; |
| 31 | uint32_t *packet_sizes; |
| 32 | int packet_sizes_alloc; |
| 33 | } PMPContext; |
| 34 | |
| 35 | static int pmp_probe(AVProbeData *p) { |
| 36 | if (AV_RN32(p->buf) == AV_RN32("pmpm") && |
| 37 | AV_RL32(p->buf + 4) == 1) |
| 38 | return AVPROBE_SCORE_MAX; |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | static int pmp_header(AVFormatContext *s) |
| 43 | { |
| 44 | PMPContext *pmp = s->priv_data; |
| 45 | AVIOContext *pb = s->pb; |
| 46 | int tb_num, tb_den; |
| 47 | uint32_t index_cnt; |
| 48 | int audio_codec_id = AV_CODEC_ID_NONE; |
| 49 | int srate, channels; |
| 50 | unsigned i; |
| 51 | uint64_t pos; |
| 52 | int64_t fsize = avio_size(pb); |
| 53 | |
| 54 | AVStream *vst = avformat_new_stream(s, NULL); |
| 55 | if (!vst) |
| 56 | return AVERROR(ENOMEM); |
| 57 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; |
| 58 | avio_skip(pb, 8); |
| 59 | switch (avio_rl32(pb)) { |
| 60 | case 0: |
| 61 | vst->codec->codec_id = AV_CODEC_ID_MPEG4; |
| 62 | break; |
| 63 | case 1: |
| 64 | vst->codec->codec_id = AV_CODEC_ID_H264; |
| 65 | break; |
| 66 | default: |
| 67 | av_log(s, AV_LOG_ERROR, "Unsupported video format\n"); |
| 68 | break; |
| 69 | } |
| 70 | index_cnt = avio_rl32(pb); |
| 71 | vst->codec->width = avio_rl32(pb); |
| 72 | vst->codec->height = avio_rl32(pb); |
| 73 | |
| 74 | tb_num = avio_rl32(pb); |
| 75 | tb_den = avio_rl32(pb); |
| 76 | avpriv_set_pts_info(vst, 32, tb_num, tb_den); |
| 77 | vst->nb_frames = index_cnt; |
| 78 | vst->duration = index_cnt; |
| 79 | |
| 80 | switch (avio_rl32(pb)) { |
| 81 | case 0: |
| 82 | audio_codec_id = AV_CODEC_ID_MP3; |
| 83 | break; |
| 84 | case 1: |
| 85 | av_log(s, AV_LOG_ERROR, "AAC not yet correctly supported\n"); |
| 86 | audio_codec_id = AV_CODEC_ID_AAC; |
| 87 | break; |
| 88 | default: |
| 89 | av_log(s, AV_LOG_ERROR, "Unsupported audio format\n"); |
| 90 | break; |
| 91 | } |
| 92 | pmp->num_streams = avio_rl16(pb) + 1; |
| 93 | avio_skip(pb, 10); |
| 94 | srate = avio_rl32(pb); |
| 95 | channels = avio_rl32(pb) + 1; |
| 96 | pos = avio_tell(pb) + 4LL*index_cnt; |
| 97 | for (i = 0; i < index_cnt; i++) { |
| 98 | uint32_t size = avio_rl32(pb); |
| 99 | int flags = size & 1 ? AVINDEX_KEYFRAME : 0; |
| 100 | if (avio_feof(pb)) { |
| 101 | av_log(s, AV_LOG_FATAL, "Encountered EOF while reading index.\n"); |
| 102 | return AVERROR_INVALIDDATA; |
| 103 | } |
| 104 | size >>= 1; |
| 105 | if (size < 9 + 4*pmp->num_streams) { |
| 106 | av_log(s, AV_LOG_ERROR, "Packet too small\n"); |
| 107 | return AVERROR_INVALIDDATA; |
| 108 | } |
| 109 | av_add_index_entry(vst, pos, i, size, 0, flags); |
| 110 | pos += size; |
| 111 | if (fsize > 0 && i == 0 && pos > fsize) { |
| 112 | av_log(s, AV_LOG_ERROR, "File ends before first packet\n"); |
| 113 | return AVERROR_INVALIDDATA; |
| 114 | } |
| 115 | } |
| 116 | for (i = 1; i < pmp->num_streams; i++) { |
| 117 | AVStream *ast = avformat_new_stream(s, NULL); |
| 118 | if (!ast) |
| 119 | return AVERROR(ENOMEM); |
| 120 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
| 121 | ast->codec->codec_id = audio_codec_id; |
| 122 | ast->codec->channels = channels; |
| 123 | ast->codec->sample_rate = srate; |
| 124 | avpriv_set_pts_info(ast, 32, 1, srate); |
| 125 | } |
| 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | static int pmp_packet(AVFormatContext *s, AVPacket *pkt) |
| 130 | { |
| 131 | PMPContext *pmp = s->priv_data; |
| 132 | AVIOContext *pb = s->pb; |
| 133 | int ret = 0; |
| 134 | int i; |
| 135 | |
| 136 | if (avio_feof(pb)) |
| 137 | return AVERROR_EOF; |
| 138 | if (pmp->cur_stream == 0) { |
| 139 | int num_packets; |
| 140 | pmp->audio_packets = avio_r8(pb); |
| 141 | |
| 142 | if (!pmp->audio_packets) { |
| 143 | av_log(s, AV_LOG_ERROR, "No audio packets.\n"); |
| 144 | return AVERROR_INVALIDDATA; |
| 145 | } |
| 146 | |
| 147 | num_packets = (pmp->num_streams - 1) * pmp->audio_packets + 1; |
| 148 | avio_skip(pb, 8); |
| 149 | pmp->current_packet = 0; |
| 150 | av_fast_malloc(&pmp->packet_sizes, |
| 151 | &pmp->packet_sizes_alloc, |
| 152 | num_packets * sizeof(*pmp->packet_sizes)); |
| 153 | if (!pmp->packet_sizes_alloc) { |
| 154 | av_log(s, AV_LOG_ERROR, "Cannot (re)allocate packet buffer\n"); |
| 155 | return AVERROR(ENOMEM); |
| 156 | } |
| 157 | for (i = 0; i < num_packets; i++) |
| 158 | pmp->packet_sizes[i] = avio_rl32(pb); |
| 159 | } |
| 160 | ret = av_get_packet(pb, pkt, pmp->packet_sizes[pmp->current_packet]); |
| 161 | if (ret >= 0) { |
| 162 | ret = 0; |
| 163 | pkt->stream_index = pmp->cur_stream; |
| 164 | } |
| 165 | if (pmp->current_packet % pmp->audio_packets == 0) |
| 166 | pmp->cur_stream = (pmp->cur_stream + 1) % pmp->num_streams; |
| 167 | pmp->current_packet++; |
| 168 | return ret; |
| 169 | } |
| 170 | |
| 171 | static int pmp_seek(AVFormatContext *s, int stream_index, int64_t ts, int flags) |
| 172 | { |
| 173 | PMPContext *pmp = s->priv_data; |
| 174 | pmp->cur_stream = 0; |
| 175 | // fall back on default seek now |
| 176 | return -1; |
| 177 | } |
| 178 | |
| 179 | static int pmp_close(AVFormatContext *s) |
| 180 | { |
| 181 | PMPContext *pmp = s->priv_data; |
| 182 | av_freep(&pmp->packet_sizes); |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | AVInputFormat ff_pmp_demuxer = { |
| 187 | .name = "pmp", |
| 188 | .long_name = NULL_IF_CONFIG_SMALL("Playstation Portable PMP"), |
| 189 | .priv_data_size = sizeof(PMPContext), |
| 190 | .read_probe = pmp_probe, |
| 191 | .read_header = pmp_header, |
| 192 | .read_packet = pmp_packet, |
| 193 | .read_seek = pmp_seek, |
| 194 | .read_close = pmp_close, |
| 195 | }; |