diff options
Diffstat (limited to 'ffmpeg1/libavutil/audio_fifo.c')
| -rw-r--r-- | ffmpeg1/libavutil/audio_fifo.c | 194 |
1 files changed, 0 insertions, 194 deletions
diff --git a/ffmpeg1/libavutil/audio_fifo.c b/ffmpeg1/libavutil/audio_fifo.c deleted file mode 100644 index b562537..0000000 --- a/ffmpeg1/libavutil/audio_fifo.c +++ /dev/null @@ -1,194 +0,0 @@ -/* - * Audio FIFO - * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com> - * - * This file is part of Libav. - * - * Libav 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. - * - * Libav 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 Libav; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * Audio FIFO - */ - -#include "avutil.h" -#include "audio_fifo.h" -#include "common.h" -#include "fifo.h" -#include "mem.h" -#include "samplefmt.h" - -struct AVAudioFifo { - AVFifoBuffer **buf; /**< single buffer for interleaved, per-channel buffers for planar */ - int nb_buffers; /**< number of buffers */ - int nb_samples; /**< number of samples currently in the FIFO */ - int allocated_samples; /**< current allocated size, in samples */ - - int channels; /**< number of channels */ - enum AVSampleFormat sample_fmt; /**< sample format */ - int sample_size; /**< size, in bytes, of one sample in a buffer */ -}; - -void av_audio_fifo_free(AVAudioFifo *af) -{ - if (af) { - if (af->buf) { - int i; - for (i = 0; i < af->nb_buffers; i++) { - if (af->buf[i]) - av_fifo_free(af->buf[i]); - } - av_free(af->buf); - } - av_free(af); - } -} - -AVAudioFifo *av_audio_fifo_alloc(enum AVSampleFormat sample_fmt, int channels, - int nb_samples) -{ - AVAudioFifo *af; - int buf_size, i; - - /* get channel buffer size (also validates parameters) */ - if (av_samples_get_buffer_size(&buf_size, channels, nb_samples, sample_fmt, 1) < 0) - return NULL; - - af = av_mallocz(sizeof(*af)); - if (!af) - return NULL; - - af->channels = channels; - af->sample_fmt = sample_fmt; - af->sample_size = buf_size / nb_samples; - af->nb_buffers = av_sample_fmt_is_planar(sample_fmt) ? channels : 1; - - af->buf = av_mallocz(af->nb_buffers * sizeof(*af->buf)); - if (!af->buf) - goto error; - - for (i = 0; i < af->nb_buffers; i++) { - af->buf[i] = av_fifo_alloc(buf_size); - if (!af->buf[i]) - goto error; - } - af->allocated_samples = nb_samples; - - return af; - -error: - av_audio_fifo_free(af); - return NULL; -} - -int av_audio_fifo_realloc(AVAudioFifo *af, int nb_samples) -{ - int i, ret, buf_size; - - if ((ret = av_samples_get_buffer_size(&buf_size, af->channels, nb_samples, - af->sample_fmt, 1)) < 0) - return ret; - - for (i = 0; i < af->nb_buffers; i++) { - if ((ret = av_fifo_realloc2(af->buf[i], buf_size)) < 0) - return ret; - } - af->allocated_samples = nb_samples; - return 0; -} - -int av_audio_fifo_write(AVAudioFifo *af, void **data, int nb_samples) -{ - int i, ret, size; - - /* automatically reallocate buffers if needed */ - if (av_audio_fifo_space(af) < nb_samples) { - int current_size = av_audio_fifo_size(af); - /* check for integer overflow in new size calculation */ - if (INT_MAX / 2 - current_size < nb_samples) - return AVERROR(EINVAL); - /* reallocate buffers */ - if ((ret = av_audio_fifo_realloc(af, 2 * (current_size + nb_samples))) < 0) - return ret; - } - - size = nb_samples * af->sample_size; - for (i = 0; i < af->nb_buffers; i++) { - ret = av_fifo_generic_write(af->buf[i], data[i], size, NULL); - if (ret != size) - return AVERROR_BUG; - } - af->nb_samples += nb_samples; - - return nb_samples; -} - -int av_audio_fifo_read(AVAudioFifo *af, void **data, int nb_samples) -{ - int i, ret, size; - - if (nb_samples < 0) - return AVERROR(EINVAL); - nb_samples = FFMIN(nb_samples, af->nb_samples); - if (!nb_samples) - return 0; - - size = nb_samples * af->sample_size; - for (i = 0; i < af->nb_buffers; i++) { - if ((ret = av_fifo_generic_read(af->buf[i], data[i], size, NULL)) < 0) - return AVERROR_BUG; - } - af->nb_samples -= nb_samples; - - return nb_samples; -} - -int av_audio_fifo_drain(AVAudioFifo *af, int nb_samples) -{ - int i, size; - - if (nb_samples < 0) - return AVERROR(EINVAL); - nb_samples = FFMIN(nb_samples, af->nb_samples); - - if (nb_samples) { - size = nb_samples * af->sample_size; - for (i = 0; i < af->nb_buffers; i++) - av_fifo_drain(af->buf[i], size); - af->nb_samples -= nb_samples; - } - return 0; -} - -void av_audio_fifo_reset(AVAudioFifo *af) -{ - int i; - - for (i = 0; i < af->nb_buffers; i++) - av_fifo_reset(af->buf[i]); - - af->nb_samples = 0; -} - -int av_audio_fifo_size(AVAudioFifo *af) -{ - return af->nb_samples; -} - -int av_audio_fifo_space(AVAudioFifo *af) -{ - return af->allocated_samples - af->nb_samples; -} |