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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 | }; |