1 files changed, 113 insertions, 0 deletions
diff --git a/media/ffvpx/libavcodec/audio_frame_queue.c b/media/ffvpx/libavcodec/audio_frame_queue.c
new file mode 100644
index 0000000000..08b4b368c7
--- /dev/null
+++ b/media/ffvpx/libavcodec/audio_frame_queue.c
@@ -0,0 +1,113 @@
+/*
+ * Audio Frame Queue
+ * Copyright (c) 2012 Justin Ruggles
+ *
+ * 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
+ */
+
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "audio_frame_queue.h"
+#include "encode.h"
+#include "libavutil/avassert.h"
+
+av_cold void ff_af_queue_init(AVCodecContext *avctx, AudioFrameQueue *afq)
+{
+    afq->avctx = avctx;
+    afq->remaining_delay   = avctx->initial_padding;
+    afq->remaining_samples = avctx->initial_padding;
+    afq->frame_count       = 0;
+}
+
+void ff_af_queue_close(AudioFrameQueue *afq)
+{
+    if(afq->frame_count)
+        av_log(afq->avctx, AV_LOG_WARNING, "%d frames left in the queue on closing\n", afq->frame_count);
+    av_freep(&afq->frames);
+    memset(afq, 0, sizeof(*afq));
+}
+
+int ff_af_queue_add(AudioFrameQueue *afq, const AVFrame *f)
+{
+    AudioFrame *new = av_fast_realloc(afq->frames, &afq->frame_alloc, sizeof(*afq->frames)*(afq->frame_count+1));
+    if(!new)
+        return AVERROR(ENOMEM);
+    afq->frames = new;
+    new += afq->frame_count;
+
+    /* get frame parameters */
+    new->duration = f->nb_samples;
+    new->duration += afq->remaining_delay;
+    if (f->pts != AV_NOPTS_VALUE) {
+        new->pts = av_rescale_q(f->pts,
+                                      afq->avctx->time_base,
+                                      (AVRational){ 1, afq->avctx->sample_rate });
+        new->pts -= afq->remaining_delay;
+        if(afq->frame_count && new[-1].pts >= new->pts)
+            av_log(afq->avctx, AV_LOG_WARNING, "Queue input is backward in time\n");
+    } else {
+        new->pts = AV_NOPTS_VALUE;
+    }
+    afq->remaining_delay = 0;
+
+    /* add frame sample count */
+    afq->remaining_samples += f->nb_samples;
+
+    afq->frame_count++;
+
+    return 0;
+}
+
+void ff_af_queue_remove(AudioFrameQueue *afq, int nb_samples, int64_t *pts,
+                        int64_t *duration)
+{
+    int64_t out_pts = AV_NOPTS_VALUE;
+    int removed_samples = 0;
+    int i;
+
+    if (afq->frame_count || afq->frame_alloc) {
+        if (afq->frames->pts != AV_NOPTS_VALUE)
+            out_pts = afq->frames->pts;
+    }
+    if(!afq->frame_count)
+        av_log(afq->avctx, AV_LOG_WARNING, "Trying to remove %d samples, but the queue is empty\n", nb_samples);
+    if (pts)
+        *pts = ff_samples_to_time_base(afq->avctx, out_pts);
+
+    for(i=0; nb_samples && i<afq->frame_count; i++){
+        int n= FFMIN(afq->frames[i].duration, nb_samples);
+        afq->frames[i].duration -= n;
+        nb_samples              -= n;
+        removed_samples         += n;
+        if(afq->frames[i].pts != AV_NOPTS_VALUE)
+            afq->frames[i].pts      += n;
+    }
+    afq->remaining_samples -= removed_samples;
+    i -= i && afq->frames[i-1].duration;
+    memmove(afq->frames, afq->frames + i, sizeof(*afq->frames) * (afq->frame_count - i));
+    afq->frame_count -= i;
+
+    if(nb_samples){
+        av_assert0(!afq->frame_count);
+        av_assert0(afq->remaining_samples == afq->remaining_delay);
+        if(afq->frames && afq->frames[0].pts != AV_NOPTS_VALUE)
+            afq->frames[0].pts += nb_samples;
+        av_log(afq->avctx, AV_LOG_DEBUG, "Trying to remove %d more samples than there are in the queue\n", nb_samples);
+    }
+    if (duration)
+        *duration = ff_samples_to_time_base(afq->avctx, removed_samples);
+}