Get rid of unnecessary pointer casts.
[ffmpeg.git] / libavcodec / faad.c
1 /*
2  * Faad decoder
3  * Copyright (c) 2003 Zdenek Kabelac.
4  * Copyright (c) 2004 Thomas Raivio.
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22
23 /**
24  * @file faad.c
25  * AAC decoder.
26  *
27  * still a bit unfinished - but it plays something
28  */
29
30 #include "avcodec.h"
31 #include "faad.h"
32
33 #ifndef FAADAPI
34 #define FAADAPI
35 #endif
36
37 /*
38  * when CONFIG_LIBFAADBIN is defined the libfaad will be opened at runtime
39  */
40 //#undef CONFIG_LIBFAADBIN
41 //#define CONFIG_LIBFAADBIN
42
43 #ifdef CONFIG_LIBFAADBIN
44 #include <dlfcn.h>
45 static const char* libfaadname = "libfaad.so.0";
46 #else
47 #define dlopen(a)
48 #define dlclose(a)
49 #endif
50
51 typedef struct {
52     void* handle;               /* dlopen handle */
53     void* faac_handle;          /* FAAD library handle */
54     int sample_size;
55     int init;
56
57     /* faad calls */
58     faacDecHandle FAADAPI (*faacDecOpen)(void);
59     faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
60 #ifndef FAAD2_VERSION
61         int FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
62                                            faacDecConfigurationPtr config);
63         int FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
64                                 unsigned char *buffer,
65                                 unsigned long *samplerate,
66                                 unsigned long *channels);
67         int FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
68                                 unsigned long SizeOfDecoderSpecificInfo,
69                                 unsigned long *samplerate, unsigned long *channels);
70         int FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
71                                 unsigned char *buffer,
72                                 unsigned long *bytesconsumed,
73                                 short *sample_buffer,
74                                 unsigned long *samples);
75 #else
76         unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
77                                                      faacDecConfigurationPtr config);
78         long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
79                                    unsigned char *buffer,
80                                  unsigned long buffer_size,
81                                  unsigned long *samplerate,
82                                  unsigned char *channels);
83         char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
84                                  unsigned long SizeOfDecoderSpecificInfo,
85                                  unsigned long *samplerate, unsigned char *channels);
86         void *FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
87                                          faacDecFrameInfo *hInfo,
88                                          unsigned char *buffer,
89                                                                  unsigned long buffer_size);
90         char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
91 #endif
92
93     void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
94
95
96 } FAACContext;
97
98 static const unsigned long faac_srates[] =
99 {
100     96000, 88200, 64000, 48000, 44100, 32000,
101     24000, 22050, 16000, 12000, 11025, 8000
102 };
103
104 static int faac_init_mp4(AVCodecContext *avctx)
105 {
106     FAACContext *s = avctx->priv_data;
107     unsigned long samplerate;
108 #ifndef FAAD2_VERSION
109     unsigned long channels;
110 #else
111     unsigned char channels;
112 #endif
113     int r = 0;
114
115     if (avctx->extradata){
116         r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
117                             avctx->extradata_size,
118                             &samplerate, &channels);
119         if (r < 0){
120             av_log(avctx, AV_LOG_ERROR,
121                    "faacDecInit2 failed r:%d   sr:%ld  ch:%ld  s:%d\n",
122                    r, samplerate, (long)channels, avctx->extradata_size);
123         } else {
124             avctx->sample_rate = samplerate;
125             avctx->channels = channels;
126             s->init = 1;
127         }
128     }
129
130     return r;
131 }
132
133 static int faac_decode_frame(AVCodecContext *avctx,
134                              void *data, int *data_size,
135                              uint8_t *buf, int buf_size)
136 {
137     FAACContext *s = avctx->priv_data;
138 #ifndef FAAD2_VERSION
139     unsigned long bytesconsumed;
140     short *sample_buffer = NULL;
141     unsigned long samples;
142     int out;
143 #else
144     faacDecFrameInfo frame_info;
145     void *out;
146 #endif
147     if(buf_size == 0)
148         return 0;
149 #ifndef FAAD2_VERSION
150     out = s->faacDecDecode(s->faac_handle,
151                            (unsigned char*)buf,
152                            &bytesconsumed,
153                            data,
154                            &samples);
155     samples *= s->sample_size;
156     if (data_size)
157         *data_size = samples;
158     return (buf_size < (int)bytesconsumed)
159         ? buf_size : (int)bytesconsumed;
160 #else
161
162     if(!s->init){
163         unsigned long srate;
164         unsigned char channels;
165         int r = s->faacDecInit(s->faac_handle, buf, buf_size, &srate, &channels);
166         if(r < 0){
167             av_log(avctx, AV_LOG_ERROR, "faac: codec init failed: %s\n",
168                    s->faacDecGetErrorMessage(frame_info.error));
169             return -1;
170         }
171         avctx->sample_rate = srate;
172         avctx->channels = channels;
173         s->init = 1;
174     }
175
176     out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf, (unsigned long)buf_size);
177
178     if (frame_info.error > 0) {
179         av_log(avctx, AV_LOG_ERROR, "faac: frame decoding failed: %s\n",
180                 s->faacDecGetErrorMessage(frame_info.error));
181         return -1;
182     }
183
184     frame_info.samples *= s->sample_size;
185     memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
186
187     if (data_size)
188         *data_size = frame_info.samples;
189
190     return (buf_size < (int)frame_info.bytesconsumed)
191         ? buf_size : (int)frame_info.bytesconsumed;
192 #endif
193 }
194
195 static int faac_decode_end(AVCodecContext *avctx)
196 {
197     FAACContext *s = avctx->priv_data;
198
199     s->faacDecClose(s->faac_handle);
200
201     dlclose(s->handle);
202     return 0;
203 }
204
205 static int faac_decode_init(AVCodecContext *avctx)
206 {
207     FAACContext *s = avctx->priv_data;
208     faacDecConfigurationPtr faac_cfg;
209
210 #ifdef CONFIG_LIBFAADBIN
211     const char* err = 0;
212
213     s->handle = dlopen(libfaadname, RTLD_LAZY);
214     if (!s->handle)
215     {
216         av_log(avctx, AV_LOG_ERROR, "FAAD library: %s could not be opened! \n%s\n",
217                 libfaadname, dlerror());
218         return -1;
219     }
220 #define dfaac(a, b) \
221     do { static const char* n = "faacDec" #a; \
222     if ((s->faacDec ## a = b dlsym( s->handle, n )) == NULL) { err = n; break; } } while(0)
223     for(;;) {
224 #else  /* !CONFIG_LIBFAADBIN */
225 #define dfaac(a, b)     s->faacDec ## a = faacDec ## a
226 #endif /* CONFIG_LIBFAADBIN */
227
228         // resolve all needed function calls
229         dfaac(Open, (faacDecHandle FAADAPI (*)(void)));
230         dfaac(Close, (void FAADAPI (*)(faacDecHandle hDecoder)));
231         dfaac(GetCurrentConfiguration, (faacDecConfigurationPtr
232                                         FAADAPI (*)(faacDecHandle)));
233 #ifndef FAAD2_VERSION
234         dfaac(SetConfiguration, (int FAADAPI (*)(faacDecHandle,
235                                                            faacDecConfigurationPtr)));
236
237         dfaac(Init, (int FAADAPI (*)(faacDecHandle, unsigned char*,
238                                      unsigned long*, unsigned long*)));
239     dfaac(Init2, (int FAADAPI (*)(faacDecHandle, unsigned char*,
240                                        unsigned long, unsigned long*,
241                                        unsigned long*)));
242         dfaac(Decode, (int FAADAPI (*)(faacDecHandle, unsigned char*,
243                              unsigned long*, short*, unsigned long*)));
244 #else
245         dfaac(SetConfiguration, (unsigned char FAADAPI (*)(faacDecHandle,
246                                                            faacDecConfigurationPtr)));
247         dfaac(Init, (long FAADAPI (*)(faacDecHandle, unsigned char*,
248                                      unsigned long, unsigned long*, unsigned char*)));
249         dfaac(Init2, (char FAADAPI (*)(faacDecHandle, unsigned char*,
250                                        unsigned long, unsigned long*,
251                                        unsigned char*)));
252         dfaac(Decode, (void *FAADAPI (*)(faacDecHandle, faacDecFrameInfo*,
253                              unsigned char*, unsigned long)));
254         dfaac(GetErrorMessage, (char* FAADAPI (*)(unsigned char)));
255 #endif
256 #undef dfacc
257
258 #ifdef CONFIG_LIBFAADBIN
259         break;
260     }
261     if (err) {
262         dlclose(s->handle);
263         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot resolve %s in %s!\n",
264                 err, libfaadname);
265         return -1;
266     }
267 #endif
268
269     s->faac_handle = s->faacDecOpen();
270     if (!s->faac_handle) {
271         av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
272         faac_decode_end(avctx);
273         return -1;
274     }
275
276
277     faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
278
279     if (faac_cfg) {
280         switch (avctx->bits_per_sample) {
281         case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_sample); break;
282         default:
283         case 16:
284 #ifdef FAAD2_VERSION
285             faac_cfg->outputFormat = FAAD_FMT_16BIT;
286 #endif
287             s->sample_size = 2;
288             break;
289         case 24:
290 #ifdef FAAD2_VERSION
291             faac_cfg->outputFormat = FAAD_FMT_24BIT;
292 #endif
293             s->sample_size = 3;
294             break;
295         case 32:
296 #ifdef FAAD2_VERSION
297             faac_cfg->outputFormat = FAAD_FMT_32BIT;
298 #endif
299             s->sample_size = 4;
300             break;
301         }
302
303         faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
304         faac_cfg->defObjectType = LC;
305     }
306
307     s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
308
309     faac_init_mp4(avctx);
310
311     return 0;
312 }
313
314 #define AAC_CODEC(id, name)     \
315 AVCodec name ## _decoder = {    \
316     #name,                      \
317     CODEC_TYPE_AUDIO,           \
318     id,                         \
319     sizeof(FAACContext),        \
320     faac_decode_init,           \
321     NULL,                       \
322     faac_decode_end,            \
323     faac_decode_frame,          \
324 }
325
326 // FIXME - raw AAC files - maybe just one entry will be enough
327 AAC_CODEC(CODEC_ID_AAC, aac);
328 #if LIBAVCODEC_VERSION_INT < ((52<<16)+(0<<8)+0)
329 // If it's mp4 file - usually embeded into Qt Mov
330 AAC_CODEC(CODEC_ID_MPEG4AAC, mpeg4aac);
331 #endif
332
333 #undef AAC_CODEC