making act segmenter

1 files changed, 237 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/libfaac.c b/ffmpeg/libavcodec/libfaac.c
new file mode 100644
index 0000000..ac18fe2
--- /dev/null
+++ b/ffmpeg/libavcodec/libfaac.c
@@ -0,0 +1,237 @@
+/*
+ * Interface to libfaac for aac encoding
+ * Copyright (c) 2002 Gildas Bazin <gbazin@netcourrier.com>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * Interface to libfaac for aac encoding.
+ */
+
+#include <faac.h>
+
+#include "libavutil/channel_layout.h"
+#include "libavutil/common.h"
+#include "avcodec.h"
+#include "audio_frame_queue.h"
+#include "internal.h"
+
+
+/* libfaac has an encoder delay of 1024 samples */
+#define FAAC_DELAY_SAMPLES 1024
+
+typedef struct FaacAudioContext {
+    faacEncHandle faac_handle;
+    AudioFrameQueue afq;
+} FaacAudioContext;
+
+static av_cold int Faac_encode_close(AVCodecContext *avctx)
+{
+    FaacAudioContext *s = avctx->priv_data;
+
+    av_freep(&avctx->extradata);
+    ff_af_queue_close(&s->afq);
+
+    if (s->faac_handle)
+        faacEncClose(s->faac_handle);
+
+    return 0;
+}
+
+static const int channel_maps[][6] = {
+    { 2, 0, 1 },          //< C L R
+    { 2, 0, 1, 3 },       //< C L R Cs
+    { 2, 0, 1, 3, 4 },    //< C L R Ls Rs
+    { 2, 0, 1, 4, 5, 3 }, //< C L R Ls Rs LFE
+};
+
+static av_cold int Faac_encode_init(AVCodecContext *avctx)
+{
+    FaacAudioContext *s = avctx->priv_data;
+    faacEncConfigurationPtr faac_cfg;
+    unsigned long samples_input, max_bytes_output;
+    int ret;
+
+    /* number of channels */
+    if (avctx->channels < 1 || avctx->channels > 6) {
+        av_log(avctx, AV_LOG_ERROR, "encoding %d channel(s) is not allowed\n", avctx->channels);
+        ret = AVERROR(EINVAL);
+        goto error;
+    }
+
+    s->faac_handle = faacEncOpen(avctx->sample_rate,
+                                 avctx->channels,
+                                 &samples_input, &max_bytes_output);
+    if (!s->faac_handle) {
+        av_log(avctx, AV_LOG_ERROR, "error in faacEncOpen()\n");
+        ret = AVERROR_UNKNOWN;
+        goto error;
+    }
+
+    /* check faac version */
+    faac_cfg = faacEncGetCurrentConfiguration(s->faac_handle);
+    if (faac_cfg->version != FAAC_CFG_VERSION) {
+        av_log(avctx, AV_LOG_ERROR, "wrong libfaac version (compiled for: %d, using %d)\n", FAAC_CFG_VERSION, faac_cfg->version);
+        ret = AVERROR(EINVAL);
+        goto error;
+    }
+
+    /* put the options in the configuration struct */
+    switch(avctx->profile) {
+        case FF_PROFILE_AAC_MAIN:
+            faac_cfg->aacObjectType = MAIN;
+            break;
+        case FF_PROFILE_UNKNOWN:
+        case FF_PROFILE_AAC_LOW:
+            faac_cfg->aacObjectType = LOW;
+            break;
+        case FF_PROFILE_AAC_SSR:
+            faac_cfg->aacObjectType = SSR;
+            break;
+        case FF_PROFILE_AAC_LTP:
+            faac_cfg->aacObjectType = LTP;
+            break;
+        default:
+            av_log(avctx, AV_LOG_ERROR, "invalid AAC profile\n");
+            ret = AVERROR(EINVAL);
+            goto error;
+    }
+    faac_cfg->mpegVersion = MPEG4;
+    faac_cfg->useTns = 0;
+    faac_cfg->allowMidside = 1;
+    faac_cfg->bitRate = avctx->bit_rate / avctx->channels;
+    faac_cfg->bandWidth = avctx->cutoff;
+    if(avctx->flags & CODEC_FLAG_QSCALE) {
+        faac_cfg->bitRate = 0;
+        faac_cfg->quantqual = avctx->global_quality / FF_QP2LAMBDA;
+    }
+    faac_cfg->outputFormat = 1;
+    faac_cfg->inputFormat = FAAC_INPUT_16BIT;
+    if (avctx->channels > 2)
+        memcpy(faac_cfg->channel_map, channel_maps[avctx->channels-3],
+               avctx->channels * sizeof(int));
+
+    avctx->frame_size = samples_input / avctx->channels;
+
+    /* Set decoder specific info */
+    avctx->extradata_size = 0;
+    if (avctx->flags & CODEC_FLAG_GLOBAL_HEADER) {
+
+        unsigned char *buffer = NULL;
+        unsigned long decoder_specific_info_size;
+
+        if (!faacEncGetDecoderSpecificInfo(s->faac_handle, &buffer,
+                                           &decoder_specific_info_size)) {
+            avctx->extradata = av_malloc(decoder_specific_info_size + FF_INPUT_BUFFER_PADDING_SIZE);
+            if (!avctx->extradata) {
+                ret = AVERROR(ENOMEM);
+                goto error;
+            }
+            avctx->extradata_size = decoder_specific_info_size;
+            memcpy(avctx->extradata, buffer, avctx->extradata_size);
+            faac_cfg->outputFormat = 0;
+        }
+        free(buffer);
+    }
+
+    if (!faacEncSetConfiguration(s->faac_handle, faac_cfg)) {
+        av_log(avctx, AV_LOG_ERROR, "libfaac doesn't support this output format!\n");
+        ret = AVERROR(EINVAL);
+        goto error;
+    }
+
+    avctx->delay = FAAC_DELAY_SAMPLES;
+    ff_af_queue_init(avctx, &s->afq);
+
+    return 0;
+error:
+    Faac_encode_close(avctx);
+    return ret;
+}
+
+static int Faac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
+                             const AVFrame *frame, int *got_packet_ptr)
+{
+    FaacAudioContext *s = avctx->priv_data;
+    int bytes_written, ret;
+    int num_samples  = frame ? frame->nb_samples : 0;
+    void *samples    = frame ? frame->data[0]    : NULL;
+
+    if ((ret = ff_alloc_packet2(avctx, avpkt, (7 + 768) * avctx->channels)) < 0)
+        return ret;
+
+    bytes_written = faacEncEncode(s->faac_handle, samples,
+                                  num_samples * avctx->channels,
+                                  avpkt->data, avpkt->size);
+    if (bytes_written < 0) {
+        av_log(avctx, AV_LOG_ERROR, "faacEncEncode() error\n");
+        return bytes_written;
+    }
+
+    /* add current frame to the queue */
+    if (frame) {
+        if ((ret = ff_af_queue_add(&s->afq, frame)) < 0)
+            return ret;
+    }
+
+    if (!bytes_written)
+        return 0;
+
+    /* Get the next frame pts/duration */
+    ff_af_queue_remove(&s->afq, avctx->frame_size, &avpkt->pts,
+                       &avpkt->duration);
+
+    avpkt->size = bytes_written;
+    *got_packet_ptr = 1;
+    return 0;
+}
+
+static const AVProfile profiles[] = {
+    { FF_PROFILE_AAC_MAIN, "Main" },
+    { FF_PROFILE_AAC_LOW,  "LC"   },
+    { FF_PROFILE_AAC_SSR,  "SSR"  },
+    { FF_PROFILE_AAC_LTP,  "LTP"  },
+    { FF_PROFILE_UNKNOWN },
+};
+
+static const uint64_t faac_channel_layouts[] = {
+    AV_CH_LAYOUT_MONO,
+    AV_CH_LAYOUT_STEREO,
+    AV_CH_LAYOUT_SURROUND,
+    AV_CH_LAYOUT_4POINT0,
+    AV_CH_LAYOUT_5POINT0_BACK,
+    AV_CH_LAYOUT_5POINT1_BACK,
+    0
+};
+
+AVCodec ff_libfaac_encoder = {
+    .name           = "libfaac",
+    .type           = AVMEDIA_TYPE_AUDIO,
+    .id             = AV_CODEC_ID_AAC,
+    .priv_data_size = sizeof(FaacAudioContext),
+    .init           = Faac_encode_init,
+    .encode2        = Faac_encode_frame,
+    .close          = Faac_encode_close,
+    .capabilities   = CODEC_CAP_SMALL_LAST_FRAME | CODEC_CAP_DELAY,
+    .sample_fmts    = (const enum AVSampleFormat[]){ AV_SAMPLE_FMT_S16,
+                                                     AV_SAMPLE_FMT_NONE },
+    .long_name      = NULL_IF_CONFIG_SMALL("libfaac AAC (Advanced Audio Coding)"),
+    .profiles       = NULL_IF_CONFIG_SMALL(profiles),
+    .channel_layouts = faac_channel_layouts,
+};