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
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 true libfaad will be opened at runtime
39 */
40//#undef CONFIG_LIBFAADBIN
41//#define CONFIG_LIBFAADBIN 0
42//#define CONFIG_LIBFAADBIN 1
43
44#if CONFIG_LIBFAADBIN
45#include <dlfcn.h>
46static const char* const libfaadname = "libfaad.so";
47#else
48#define dlopen(a)
49#define dlclose(a)
50#endif
51
52typedef struct {
53    void* handle;               /* dlopen handle */
54    void* faac_handle;          /* FAAD library handle */
55    int sample_size;
56    int init;
57
58    /* faad calls */
59    faacDecHandle FAADAPI (*faacDecOpen)(void);
60    faacDecConfigurationPtr FAADAPI (*faacDecGetCurrentConfiguration)(faacDecHandle hDecoder);
61#ifndef FAAD2_VERSION
62    int FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
63                                           faacDecConfigurationPtr config);
64    int FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
65                               unsigned char *buffer,
66                               unsigned long *samplerate,
67                               unsigned long *channels);
68    int FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
69                                unsigned long SizeOfDecoderSpecificInfo,
70                                unsigned long *samplerate, unsigned long *channels);
71    int FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
72                                 unsigned char *buffer,
73                                 unsigned long *bytesconsumed,
74                                 short *sample_buffer,
75                                 unsigned long *samples);
76#else
77    unsigned char FAADAPI (*faacDecSetConfiguration)(faacDecHandle hDecoder,
78                                                     faacDecConfigurationPtr config);
79    long FAADAPI (*faacDecInit)(faacDecHandle hDecoder,
80                                unsigned char *buffer,
81                                unsigned long buffer_size,
82                                unsigned long *samplerate,
83                                unsigned char *channels);
84    char FAADAPI (*faacDecInit2)(faacDecHandle hDecoder, unsigned char *pBuffer,
85                                 unsigned long SizeOfDecoderSpecificInfo,
86                                 unsigned long *samplerate, unsigned char *channels);
87    void *FAADAPI (*faacDecDecode)(faacDecHandle hDecoder,
88                                   faacDecFrameInfo *hInfo,
89                                   unsigned char *buffer,
90                                   unsigned long buffer_size);
91    char* FAADAPI (*faacDecGetErrorMessage)(unsigned char errcode);
92#endif
93
94    void FAADAPI (*faacDecClose)(faacDecHandle hDecoder);
95
96
97} FAACContext;
98
99static const unsigned long faac_srates[] =
100{
101    96000, 88200, 64000, 48000, 44100, 32000,
102    24000, 22050, 16000, 12000, 11025, 8000
103};
104
105static void channel_setup(AVCodecContext *avctx)
106{
107#ifdef FAAD2_VERSION
108    FAACContext *s = avctx->priv_data;
109    if (avctx->request_channels > 0 && avctx->request_channels == 2 &&
110        avctx->request_channels < avctx->channels) {
111        faacDecConfigurationPtr faac_cfg;
112        avctx->channels = 2;
113        faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
114        faac_cfg->downMatrix = 1;
115        s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
116    }
117#endif
118}
119
120static av_cold int faac_init_mp4(AVCodecContext *avctx)
121{
122    FAACContext *s = avctx->priv_data;
123    unsigned long samplerate;
124#ifndef FAAD2_VERSION
125    unsigned long channels;
126#else
127    unsigned char channels;
128#endif
129    int r = 0;
130
131    if (avctx->extradata){
132        r = s->faacDecInit2(s->faac_handle, (uint8_t*) avctx->extradata,
133                            avctx->extradata_size,
134                            &samplerate, &channels);
135        if (r < 0){
136            av_log(avctx, AV_LOG_ERROR,
137                   "faacDecInit2 failed r:%d   sr:%ld  ch:%ld  s:%d\n",
138                   r, samplerate, (long)channels, avctx->extradata_size);
139        } else {
140            avctx->sample_rate = samplerate;
141            avctx->channels = channels;
142            channel_setup(avctx);
143            s->init = 1;
144        }
145    }
146
147    return r;
148}
149
150static int faac_decode_frame(AVCodecContext *avctx,
151                             void *data, int *data_size,
152                             AVPacket *avpkt)
153{
154    const uint8_t *buf = avpkt->data;
155    int buf_size = avpkt->size;
156    FAACContext *s = avctx->priv_data;
157#ifndef FAAD2_VERSION
158    unsigned long bytesconsumed;
159    short *sample_buffer = NULL;
160    unsigned long samples;
161    int out;
162#else
163    faacDecFrameInfo frame_info;
164    void *out;
165#endif
166    if(buf_size == 0)
167        return 0;
168#ifndef FAAD2_VERSION
169    out = s->faacDecDecode(s->faac_handle,
170                           (unsigned char*)buf,
171                           &bytesconsumed,
172                           data,
173                           &samples);
174    samples *= s->sample_size;
175    if (data_size)
176        *data_size = samples;
177    return (buf_size < (int)bytesconsumed)
178        ? buf_size : (int)bytesconsumed;
179#else
180
181    if(!s->init){
182        unsigned long srate;
183        unsigned char channels;
184        int r = s->faacDecInit(s->faac_handle, buf, buf_size, &srate, &channels);
185        if(r < 0){
186            av_log(avctx, AV_LOG_ERROR, "libfaad: codec init failed.\n");
187            return -1;
188        }
189        avctx->sample_rate = srate;
190        avctx->channels = channels;
191        channel_setup(avctx);
192        s->init = 1;
193    }
194
195    out = s->faacDecDecode(s->faac_handle, &frame_info, (unsigned char*)buf, (unsigned long)buf_size);
196
197    if (frame_info.error > 0) {
198        av_log(avctx, AV_LOG_ERROR, "libfaad: frame decoding failed: %s\n",
199               s->faacDecGetErrorMessage(frame_info.error));
200        return -1;
201    }
202    if (!avctx->frame_size)
203        avctx->frame_size = frame_info.samples/avctx->channels;
204    frame_info.samples *= s->sample_size;
205    memcpy(data, out, frame_info.samples); // CHECKME - can we cheat this one
206
207    if (data_size)
208        *data_size = frame_info.samples;
209
210    return (buf_size < (int)frame_info.bytesconsumed)
211        ? buf_size : (int)frame_info.bytesconsumed;
212#endif
213}
214
215static av_cold int faac_decode_end(AVCodecContext *avctx)
216{
217    FAACContext *s = avctx->priv_data;
218
219    s->faacDecClose(s->faac_handle);
220
221    dlclose(s->handle);
222    return 0;
223}
224
225static av_cold int faac_decode_init(AVCodecContext *avctx)
226{
227    FAACContext *s = avctx->priv_data;
228    faacDecConfigurationPtr faac_cfg;
229
230#if CONFIG_LIBFAADBIN
231    const char* err = 0;
232
233    s->handle = dlopen(libfaadname, RTLD_LAZY);
234    if (!s->handle)
235    {
236        av_log(avctx, AV_LOG_ERROR, "FAAD library: %s could not be opened! \n%s\n",
237               libfaadname, dlerror());
238        return -1;
239    }
240
241#define dfaac(a) do {                                                   \
242        const char* n = AV_STRINGIFY(faacDec ## a);                     \
243        if (!err && !(s->faacDec ## a = dlsym(s->handle, n))) {         \
244            err = n;                                                    \
245        }                                                               \
246    } while(0)
247#else  /* !CONFIG_LIBFAADBIN */
248#define dfaac(a)     s->faacDec ## a = faacDec ## a
249#endif /* CONFIG_LIBFAADBIN */
250
251    // resolve all needed function calls
252    dfaac(Open);
253    dfaac(Close);
254    dfaac(GetCurrentConfiguration);
255    dfaac(SetConfiguration);
256    dfaac(Init);
257    dfaac(Init2);
258    dfaac(Decode);
259#ifdef FAAD2_VERSION
260    dfaac(GetErrorMessage);
261#endif
262
263#undef dfaac
264
265#if CONFIG_LIBFAADBIN
266    if (err) {
267        dlclose(s->handle);
268        av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot resolve %s in %s!\n",
269               err, libfaadname);
270        return -1;
271    }
272#endif
273
274    s->faac_handle = s->faacDecOpen();
275    if (!s->faac_handle) {
276        av_log(avctx, AV_LOG_ERROR, "FAAD library: cannot create handler!\n");
277        faac_decode_end(avctx);
278        return -1;
279    }
280
281
282    faac_cfg = s->faacDecGetCurrentConfiguration(s->faac_handle);
283
284    if (faac_cfg) {
285        switch (avctx->bits_per_coded_sample) {
286        case 8: av_log(avctx, AV_LOG_ERROR, "FAADlib unsupported bps %d\n", avctx->bits_per_coded_sample); break;
287        default:
288        case 16:
289#ifdef FAAD2_VERSION
290            faac_cfg->outputFormat = FAAD_FMT_16BIT;
291#endif
292            s->sample_size = 2;
293            break;
294        case 24:
295#ifdef FAAD2_VERSION
296            faac_cfg->outputFormat = FAAD_FMT_24BIT;
297#endif
298            s->sample_size = 3;
299            break;
300        case 32:
301#ifdef FAAD2_VERSION
302            faac_cfg->outputFormat = FAAD_FMT_32BIT;
303#endif
304            s->sample_size = 4;
305            break;
306        }
307
308        faac_cfg->defSampleRate = (!avctx->sample_rate) ? 44100 : avctx->sample_rate;
309        faac_cfg->defObjectType = LC;
310    }
311
312    s->faacDecSetConfiguration(s->faac_handle, faac_cfg);
313
314    faac_init_mp4(avctx);
315
316    if(!s->init && avctx->channels > 0)
317        channel_setup(avctx);
318
319    avctx->sample_fmt = SAMPLE_FMT_S16;
320    return 0;
321}
322
323AVCodec libfaad_decoder = {
324    "libfaad",
325    AVMEDIA_TYPE_AUDIO,
326    CODEC_ID_AAC,
327    sizeof(FAACContext),
328    faac_decode_init,
329    NULL,
330    faac_decode_end,
331    faac_decode_frame,
332    .long_name = NULL_IF_CONFIG_SMALL("libfaad AAC (Advanced Audio Codec)"),
333};
334