Commit | Line | Data |
---|---|---|
fc11dd05 | 1 | /* |
2 | * Some mp3 related code for Sega/Mega CD. | |
3 | * Uses Libav/FFmpeg libavcodec | |
4 | * (C) notaz, 2013 | |
5 | * | |
6 | * This work is licensed under the terms of MAME license. | |
7 | * See COPYING file in the top-level directory. | |
8 | */ | |
9 | ||
10 | #include <stdio.h> | |
11 | #include <string.h> | |
12 | #include <libavcodec/avcodec.h> | |
986d60fc | 13 | #include <dlfcn.h> |
fc11dd05 | 14 | |
15 | #include <pico/pico_int.h> | |
fc11dd05 | 16 | #include "mp3.h" |
17 | ||
1dfbe19d E |
18 | #if LIBAVCODEC_VERSION_MAJOR < 55 |
19 | #define AVCodecID CodecID | |
20 | #define AV_CODEC_ID_MP3 CODEC_ID_MP3 | |
faedc4f1 | 21 | #define AV_CH_LAYOUT_STEREO CH_LAYOUT_STEREO |
22 | #define AV_SAMPLE_FMT_S16 SAMPLE_FMT_S16 | |
23 | #define request_sample_fmt sample_fmt | |
1dfbe19d E |
24 | #endif |
25 | ||
faedc4f1 | 26 | static void *libavcodec; |
fc11dd05 | 27 | static AVCodecContext *ctx; |
28 | ||
986d60fc | 29 | /* avoid compile time linking to libavcodec due to huge list of it's deps.. |
30 | * we also use this old API as newer one is not available on pandora */ | |
31 | void (*p_av_init_packet)(AVPacket *pkt); | |
32 | int (*p_avcodec_decode_audio3)(AVCodecContext *avctx, int16_t *samples, | |
33 | int *frame_size_ptr, AVPacket *avpkt); | |
34 | ||
fc11dd05 | 35 | int mp3dec_decode(FILE *f, int *file_pos, int file_len) |
36 | { | |
37 | unsigned char input_buf[2 * 1024]; | |
38 | int frame_size; | |
39 | AVPacket avpkt; | |
40 | int bytes_in; | |
41 | int bytes_out; | |
42 | int offset; | |
faedc4f1 | 43 | int len = -1; |
44 | int retry = 3; | |
fc11dd05 | 45 | |
986d60fc | 46 | p_av_init_packet(&avpkt); |
fc11dd05 | 47 | |
48 | do | |
49 | { | |
50 | if (*file_pos >= file_len) | |
51 | return 1; // EOF, nothing to do | |
52 | ||
53 | fseek(f, *file_pos, SEEK_SET); | |
54 | bytes_in = fread(input_buf, 1, sizeof(input_buf), f); | |
55 | ||
56 | offset = mp3_find_sync_word(input_buf, bytes_in); | |
57 | if (offset < 0) { | |
58 | lprintf("find_sync_word (%i/%i) err %i\n", | |
59 | *file_pos, file_len, offset); | |
60 | *file_pos = file_len; | |
61 | return 1; // EOF | |
62 | } | |
faedc4f1 | 63 | *file_pos += offset; |
fc11dd05 | 64 | |
65 | // to avoid being flooded with "incorrect frame size" errors, | |
66 | // we must calculate and pass exact frame size - lame | |
67 | frame_size = mpeg1_l3_bitrates[input_buf[offset + 2] >> 4]; | |
68 | frame_size = frame_size * 144000 / 44100; | |
69 | frame_size += (input_buf[offset + 2] >> 1) & 1; | |
70 | ||
71 | if (offset > 0 && bytes_in - offset < frame_size) { | |
72 | // underflow | |
fc11dd05 | 73 | continue; |
74 | } | |
75 | ||
76 | avpkt.data = input_buf + offset; | |
77 | avpkt.size = frame_size; | |
78 | bytes_out = sizeof(cdda_out_buffer); | |
986d60fc | 79 | #if LIBAVCODEC_VERSION_MAJOR < 53 |
80 | // stupidity in v52: enforces this size even when | |
81 | // it doesn't need/use that much at all | |
82 | bytes_out = AVCODEC_MAX_AUDIO_FRAME_SIZE; | |
83 | #endif | |
fc11dd05 | 84 | |
986d60fc | 85 | len = p_avcodec_decode_audio3(ctx, cdda_out_buffer, |
fc11dd05 | 86 | &bytes_out, &avpkt); |
87 | if (len <= 0) { | |
88 | lprintf("mp3 decode err (%i/%i) %i\n", | |
89 | *file_pos, file_len, len); | |
90 | ||
91 | // attempt to skip the offending frame.. | |
faedc4f1 | 92 | *file_pos += 1; |
93 | } else | |
94 | *file_pos += len; | |
fc11dd05 | 95 | } |
faedc4f1 | 96 | while (len <= 0 && --retry > 0); |
fc11dd05 | 97 | |
faedc4f1 | 98 | return len <= 0; |
fc11dd05 | 99 | } |
100 | ||
75a30842 | 101 | int mp3dec_start(FILE *f, int fpos_start) |
fc11dd05 | 102 | { |
986d60fc | 103 | void (*avcodec_register_all)(void); |
1dfbe19d | 104 | AVCodec *(*avcodec_find_decoder)(enum AVCodecID id); |
faedc4f1 | 105 | #if LIBAVCODEC_VERSION_MAJOR < 54 |
986d60fc | 106 | AVCodecContext *(*avcodec_alloc_context)(void); |
107 | int (*avcodec_open)(AVCodecContext *avctx, AVCodec *codec); | |
faedc4f1 | 108 | #else |
109 | AVCodecContext *(*avcodec_alloc_context)(AVCodec *); | |
110 | int (*avcodec_open)(AVCodecContext *avctx, AVCodec *codec, AVDictionary **); | |
111 | #endif | |
986d60fc | 112 | void (*av_free)(void *ptr); |
fc11dd05 | 113 | AVCodec *codec; |
114 | int ret; | |
115 | ||
116 | if (ctx != NULL) | |
117 | return 0; | |
118 | ||
faedc4f1 | 119 | #if LIBAVCODEC_VERSION_MAJOR < 54 |
986d60fc | 120 | // either v52 or v53 should be ok |
faedc4f1 | 121 | if (libavcodec == NULL) |
122 | libavcodec = dlopen("libavcodec.so.52", RTLD_NOW); | |
123 | if (libavcodec == NULL) | |
124 | libavcodec = dlopen("libavcodec.so.53", RTLD_NOW); | |
125 | #else | |
126 | if (libavcodec == NULL) | |
127 | libavcodec = dlopen("libavcodec.so", RTLD_NOW); | |
128 | #endif | |
129 | if (libavcodec == NULL) { | |
986d60fc | 130 | lprintf("mp3dec: load libavcodec.so: %s\n", dlerror()); |
131 | return -1; | |
132 | } | |
133 | ||
faedc4f1 | 134 | avcodec_register_all = dlsym(libavcodec, "avcodec_register_all"); |
135 | avcodec_find_decoder = dlsym(libavcodec, "avcodec_find_decoder"); | |
136 | #if LIBAVCODEC_VERSION_MAJOR < 54 | |
137 | avcodec_alloc_context = dlsym(libavcodec, "avcodec_alloc_context"); | |
138 | avcodec_open = dlsym(libavcodec, "avcodec_open"); | |
139 | #else | |
140 | avcodec_alloc_context = dlsym(libavcodec, "avcodec_alloc_context3"); | |
141 | avcodec_open = dlsym(libavcodec, "avcodec_open2"); | |
142 | #endif | |
143 | av_free = dlsym(libavcodec, "av_free"); | |
144 | p_av_init_packet = dlsym(libavcodec, "av_init_packet"); | |
145 | p_avcodec_decode_audio3 = dlsym(libavcodec, "avcodec_decode_audio3"); | |
986d60fc | 146 | |
147 | if (avcodec_register_all == NULL || avcodec_find_decoder == NULL | |
148 | || avcodec_alloc_context == NULL || avcodec_open == NULL | |
149 | || av_free == NULL | |
150 | || p_av_init_packet == NULL || p_avcodec_decode_audio3 == NULL) | |
151 | { | |
152 | lprintf("mp3dec: missing symbol(s) in libavcodec.so\n"); | |
986d60fc | 153 | return -1; |
154 | } | |
155 | ||
fc11dd05 | 156 | // init decoder |
157 | ||
158 | //avcodec_init(); | |
159 | avcodec_register_all(); | |
160 | ||
1dfbe19d | 161 | codec = avcodec_find_decoder(AV_CODEC_ID_MP3); |
fc11dd05 | 162 | if (codec == NULL) { |
163 | lprintf("mp3dec: codec missing\n"); | |
164 | return -1; | |
165 | } | |
166 | ||
faedc4f1 | 167 | #if LIBAVCODEC_VERSION_MAJOR < 54 |
fc11dd05 | 168 | ctx = avcodec_alloc_context(); |
169 | if (ctx == NULL) { | |
170 | lprintf("mp3dec: avcodec_alloc_context failed\n"); | |
171 | return -1; | |
172 | } | |
faedc4f1 | 173 | #else |
174 | ctx = avcodec_alloc_context(codec); | |
175 | if (ctx == NULL) { | |
176 | lprintf("mp3dec: avcodec_alloc_context failed\n"); | |
177 | return -1; | |
178 | } | |
179 | #endif | |
180 | ctx->request_channel_layout = AV_CH_LAYOUT_STEREO; | |
181 | ctx->request_sample_fmt = AV_SAMPLE_FMT_S16; | |
182 | ctx->sample_rate = 44100; | |
fc11dd05 | 183 | |
faedc4f1 | 184 | #if LIBAVCODEC_VERSION_MAJOR < 54 |
fc11dd05 | 185 | ret = avcodec_open(ctx, codec); |
186 | if (ret < 0) { | |
187 | lprintf("mp3dec: avcodec_open failed: %d\n", ret); | |
188 | av_free(ctx); | |
189 | ctx = NULL; | |
190 | return -1; | |
191 | } | |
faedc4f1 | 192 | #else |
193 | ret = avcodec_open(ctx, codec, NULL); | |
194 | if (ret < 0) { | |
195 | lprintf("mp3dec: avcodec_open failed: %d\n", ret); | |
196 | av_free(ctx); | |
197 | ctx = NULL; | |
198 | return -1; | |
199 | } | |
200 | #endif | |
fc11dd05 | 201 | return 0; |
202 | } |