libavcodec/libvo-aacenc.c

   1 /*
   2  * AAC encoder wrapper
   3  * Copyright (c) 2010 Martin Storsjo
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <vo-aacenc/voAAC.h>
  23 #include <vo-aacenc/cmnMemory.h>
  24
  25 #include "avcodec.h"
  26 #include "audio_frame_queue.h"
  27 #include "internal.h"
  28 #include "mpeg4audio.h"
  29
  30 #define FRAME_SIZE 1024
  31 #define ENC_DELAY  1600
  32
  33 typedef struct AACContext {
  34     VO_AUDIO_CODECAPI codec_api;
  35     VO_HANDLE handle;
  36     VO_MEM_OPERATOR mem_operator;
  37     VO_CODEC_INIT_USERDATA user_data;
  38     VO_PBYTE end_buffer;
  39     AudioFrameQueue afq;
  40     int last_frame;
  41     int last_samples;
  42 } AACContext;
  43
  44
  45 static int aac_encode_close(AVCodecContext *avctx)
  46 {
  47     AACContext *s = avctx->priv_data;
  48
  49     s->codec_api.Uninit(s->handle);
  50 #if FF_API_OLD_ENCODE_AUDIO
  51     av_freep(&avctx->coded_frame);
  52 #endif
  53     av_freep(&avctx->extradata);
  54     ff_af_queue_close(&s->afq);
  55     av_freep(&s->end_buffer);
  56
  57     return 0;
  58 }
  59
  60 static av_cold int aac_encode_init(AVCodecContext *avctx)
  61 {
  62     AACContext *s = avctx->priv_data;
  63     AACENC_PARAM params = { 0 };
  64     int index, ret;
  65
  66 #if FF_API_OLD_ENCODE_AUDIO
  67     avctx->coded_frame = avcodec_alloc_frame();
  68     if (!avctx->coded_frame)
  69         return AVERROR(ENOMEM);
  70 #endif
  71     avctx->frame_size = FRAME_SIZE;
  72     avctx->delay      = ENC_DELAY;
  73     s->last_frame     = 2;
  74     ff_af_queue_init(avctx, &s->afq);
  75
  76     s->end_buffer = av_mallocz(avctx->frame_size * avctx->channels * 2);
  77     if (!s->end_buffer) {
  78         ret = AVERROR(ENOMEM);
  79         goto error;
  80     }
  81
  82     voGetAACEncAPI(&s->codec_api);
  83
  84     s->mem_operator.Alloc = cmnMemAlloc;
  85     s->mem_operator.Copy = cmnMemCopy;
  86     s->mem_operator.Free = cmnMemFree;
  87     s->mem_operator.Set = cmnMemSet;
  88     s->mem_operator.Check = cmnMemCheck;
  89     s->user_data.memflag = VO_IMF_USERMEMOPERATOR;
  90     s->user_data.memData = &s->mem_operator;
  91     s->codec_api.Init(&s->handle, VO_AUDIO_CodingAAC, &s->user_data);
  92
  93     params.sampleRate = avctx->sample_rate;
  94     params.bitRate    = avctx->bit_rate;
  95     params.nChannels  = avctx->channels;
  96     params.adtsUsed   = !(avctx->flags & CODEC_FLAG_GLOBAL_HEADER);
  97     if (s->codec_api.SetParam(s->handle, VO_PID_AAC_ENCPARAM, &params)
  98         != VO_ERR_NONE) {
  99         av_log(avctx, AV_LOG_ERROR, "Unable to set encoding parameters\n");
 100         ret = AVERROR(EINVAL);
 101         goto error;
 102     }
 103
 104     for (index = 0; index < 16; index++)
 105         if (avctx->sample_rate == avpriv_mpeg4audio_sample_rates[index])
 106             break;
 107     if (index == 16) {
 108         av_log(avctx, AV_LOG_ERROR, "Unsupported sample rate %d\n",
 109                                     avctx->sample_rate);
 110         ret = AVERROR(ENOSYS);
 111         goto error;
 112     }
 113     if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
 114         avctx->extradata_size = 2;
 115         avctx->extradata      = av_mallocz(avctx->extradata_size +
 116                                            FF_INPUT_BUFFER_PADDING_SIZE);
 117         if (!avctx->extradata) {
 118             ret = AVERROR(ENOMEM);
 119             goto error;
 120         }
 121
 122         avctx->extradata[0] = 0x02 << 3 | index >> 1;
 123         avctx->extradata[1] = (index & 0x01) << 7 | avctx->channels << 3;
 124     }
 125     return 0;
 126 error:
 127     aac_encode_close(avctx);
 128     return ret;
 129 }
 130
 131 static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
 132                             const AVFrame *frame, int *got_packet_ptr)
 133 {
 134     AACContext *s = avctx->priv_data;
 135     VO_CODECBUFFER input = { 0 }, output = { 0 };
 136     VO_AUDIO_OUTPUTINFO output_info = { { 0 } };
 137     VO_PBYTE samples;
 138     int ret;
 139
 140     /* handle end-of-stream small frame and flushing */
 141     if (!frame) {
 142         if (s->last_frame <= 0)
 143             return 0;
 144         if (s->last_samples > 0 && s->last_samples < ENC_DELAY - FRAME_SIZE) {
 145             s->last_samples = 0;
 146             s->last_frame--;
 147         }
 148         s->last_frame--;
 149         memset(s->end_buffer, 0, 2 * avctx->channels * avctx->frame_size);
 150         samples = s->end_buffer;
 151     } else {
 152         if (frame->nb_samples < avctx->frame_size) {
 153             s->last_samples = frame->nb_samples;
 154             memcpy(s->end_buffer, frame->data[0], 2 * avctx->channels * frame->nb_samples);
 155             samples = s->end_buffer;
 156         } else {
 157             samples = (VO_PBYTE)frame->data[0];
 158         }
 159         /* add current frame to the queue */
 160         if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
 161             return ret;
 162     }
 163
 164     if ((ret = ff_alloc_packet(avpkt, FFMAX(8192, 768 * avctx->channels)))) {
 165         av_log(avctx, AV_LOG_ERROR, "Error getting output packet\n");
 166         return ret;
 167     }
 168
 169     input.Buffer  = samples;
 170     input.Length  = 2 * avctx->channels * avctx->frame_size;
 171     output.Buffer = avpkt->data;
 172     output.Length = avpkt->size;
 173
 174     s->codec_api.SetInputData(s->handle, &input);
 175     if (s->codec_api.GetOutputData(s->handle, &output, &output_info)
 176         != VO_ERR_NONE) {
 177         av_log(avctx, AV_LOG_ERROR, "Unable to encode frame\n");
 178         return AVERROR(EINVAL);
 179     }
 180
 181     /* Get the next frame pts/duration */
 182     ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
 183                        &avpkt->duration);
 184
 185     avpkt->size = output.Length;
 186     *got_packet_ptr = 1;
 187     return 0;
 188 }
 189
 190 AVCodec ff_libvo_aacenc_encoder = {
 191     .name           = "libvo_aacenc",
 192     .type           = AVMEDIA_TYPE_AUDIO,
 193     .id             = AV_CODEC_ID_AAC,
 194     .priv_data_size = sizeof(AACContext),
 195     .init           = aac_encode_init,
 196     .encode2        = aac_encode_frame,
 197     .close          = aac_encode_close,
 198     .capabilities   = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
 199     .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
 200                                                      AV_SAMPLE_FMT_NONE },
 201     .long_name      = NULL_IF_CONFIG_SMALL("Android VisualOn AAC (Advanced Audio Coding)"),
 202 };