Skip to content

HTTPS clone URL

Subversion checkout URL

You can clone with
or
.
Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

347 lines (288 sloc) 10.35 kB
/*
* 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
*/
#include <stdint.h>
#include <string.h>
#include "libavutil/mem.h"
#include "audio_data.h"
static const AVClass audio_data_class = {
.class_name = "AudioData",
.item_name = av_default_item_name,
.version = LIBAVUTIL_VERSION_INT,
};
/*
* Calculate alignment for data pointers.
*/
static void calc_ptr_alignment(AudioData *a)
{
int p;
int min_align = 128;
for (p = 0; p < a->planes; p++) {
int cur_align = 128;
while ((intptr_t)a->data[p] % cur_align)
cur_align >>= 1;
if (cur_align < min_align)
min_align = cur_align;
}
a->ptr_align = min_align;
}
int ff_audio_data_set_channels(AudioData *a, int channels)
{
if (channels < 1 || channels > AVRESAMPLE_MAX_CHANNELS ||
channels > a->allocated_channels)
return AVERROR(EINVAL);
a->channels = channels;
a->planes = a->is_planar ? channels : 1;
calc_ptr_alignment(a);
return 0;
}
int ff_audio_data_init(AudioData *a, void **src, int plane_size, int channels,
int nb_samples, enum AVSampleFormat sample_fmt,
int read_only, const char *name)
{
int p;
memset(a, 0, sizeof(*a));
a->class = &audio_data_class;
if (channels < 1 || channels > AVRESAMPLE_MAX_CHANNELS) {
av_log(a, AV_LOG_ERROR, "invalid channel count: %d\n", channels);
return AVERROR(EINVAL);
}
a->sample_size = av_get_bytes_per_sample(sample_fmt);
if (!a->sample_size) {
av_log(a, AV_LOG_ERROR, "invalid sample format\n");
return AVERROR(EINVAL);
}
a->is_planar = av_sample_fmt_is_planar(sample_fmt);
a->planes = a->is_planar ? channels : 1;
a->stride = a->sample_size * (a->is_planar ? 1 : channels);
for (p = 0; p < (a->is_planar ? channels : 1); p++) {
if (!src[p]) {
av_log(a, AV_LOG_ERROR, "invalid NULL pointer for src[%d]\n", p);
return AVERROR(EINVAL);
}
a->data[p] = src[p];
}
a->allocated_samples = nb_samples * !read_only;
a->nb_samples = nb_samples;
a->sample_fmt = sample_fmt;
a->channels = channels;
a->allocated_channels = channels;
a->read_only = read_only;
a->allow_realloc = 0;
a->name = name ? name : "{no name}";
calc_ptr_alignment(a);
a->samples_align = plane_size / a->stride;
return 0;
}
AudioData *ff_audio_data_alloc(int channels, int nb_samples,
enum AVSampleFormat sample_fmt, const char *name)
{
AudioData *a;
int ret;
if (channels < 1 || channels > AVRESAMPLE_MAX_CHANNELS)
return NULL;
a = av_mallocz(sizeof(*a));
if (!a)
return NULL;
a->sample_size = av_get_bytes_per_sample(sample_fmt);
if (!a->sample_size) {
av_free(a);
return NULL;
}
a->is_planar = av_sample_fmt_is_planar(sample_fmt);
a->planes = a->is_planar ? channels : 1;
a->stride = a->sample_size * (a->is_planar ? 1 : channels);
a->class = &audio_data_class;
a->sample_fmt = sample_fmt;
a->channels = channels;
a->allocated_channels = channels;
a->read_only = 0;
a->allow_realloc = 1;
a->name = name ? name : "{no name}";
if (nb_samples > 0) {
ret = ff_audio_data_realloc(a, nb_samples);
if (ret < 0) {
av_free(a);
return NULL;
}
return a;
} else {
calc_ptr_alignment(a);
return a;
}
}
int ff_audio_data_realloc(AudioData *a, int nb_samples)
{
int ret, new_buf_size, plane_size, p;
/* check if buffer is already large enough */
if (a->allocated_samples >= nb_samples)
return 0;
/* validate that the output is not read-only and realloc is allowed */
if (a->read_only || !a->allow_realloc)
return AVERROR(EINVAL);
new_buf_size = av_samples_get_buffer_size(&plane_size,
a->allocated_channels, nb_samples,
a->sample_fmt, 0);
if (new_buf_size < 0)
return new_buf_size;
/* if there is already data in the buffer and the sample format is planar,
allocate a new buffer and copy the data, otherwise just realloc the
internal buffer and set new data pointers */
if (a->nb_samples > 0 && a->is_planar) {
uint8_t *new_data[AVRESAMPLE_MAX_CHANNELS] = { NULL };
ret = av_samples_alloc(new_data, &plane_size, a->allocated_channels,
nb_samples, a->sample_fmt, 0);
if (ret < 0)
return ret;
for (p = 0; p < a->planes; p++)
memcpy(new_data[p], a->data[p], a->nb_samples * a->stride);
av_freep(&a->buffer);
memcpy(a->data, new_data, sizeof(new_data));
a->buffer = a->data[0];
} else {
av_freep(&a->buffer);
a->buffer = av_malloc(new_buf_size);
if (!a->buffer)
return AVERROR(ENOMEM);
ret = av_samples_fill_arrays(a->data, &plane_size, a->buffer,
a->allocated_channels, nb_samples,
a->sample_fmt, 0);
if (ret < 0)
return ret;
}
a->buffer_size = new_buf_size;
a->allocated_samples = nb_samples;
calc_ptr_alignment(a);
a->samples_align = plane_size / a->stride;
return 0;
}
void ff_audio_data_free(AudioData **a)
{
if (!*a)
return;
av_free((*a)->buffer);
av_freep(a);
}
int ff_audio_data_copy(AudioData *dst, AudioData *src)
{
int ret, p;
/* validate input/output compatibility */
if (dst->sample_fmt != src->sample_fmt || dst->channels < src->channels)
return AVERROR(EINVAL);
/* if the input is empty, just empty the output */
if (!src->nb_samples) {
dst->nb_samples = 0;
return 0;
}
/* reallocate output if necessary */
ret = ff_audio_data_realloc(dst, src->nb_samples);
if (ret < 0)
return ret;
/* copy data */
for (p = 0; p < src->planes; p++)
memcpy(dst->data[p], src->data[p], src->nb_samples * src->stride);
dst->nb_samples = src->nb_samples;
return 0;
}
int ff_audio_data_combine(AudioData *dst, int dst_offset, AudioData *src,
int src_offset, int nb_samples)
{
int ret, p, dst_offset2, dst_move_size;
/* validate input/output compatibility */
if (dst->sample_fmt != src->sample_fmt || dst->channels != src->channels) {
av_log(src, AV_LOG_ERROR, "sample format mismatch\n");
return AVERROR(EINVAL);
}
/* validate offsets are within the buffer bounds */
if (dst_offset < 0 || dst_offset > dst->nb_samples ||
src_offset < 0 || src_offset > src->nb_samples) {
av_log(src, AV_LOG_ERROR, "offset out-of-bounds: src=%d dst=%d\n",
src_offset, dst_offset);
return AVERROR(EINVAL);
}
/* check offsets and sizes to see if we can just do nothing and return */
if (nb_samples > src->nb_samples - src_offset)
nb_samples = src->nb_samples - src_offset;
if (nb_samples <= 0)
return 0;
/* validate that the output is not read-only */
if (dst->read_only) {
av_log(dst, AV_LOG_ERROR, "dst is read-only\n");
return AVERROR(EINVAL);
}
/* reallocate output if necessary */
ret = ff_audio_data_realloc(dst, dst->nb_samples + nb_samples);
if (ret < 0) {
av_log(dst, AV_LOG_ERROR, "error reallocating dst\n");
return ret;
}
dst_offset2 = dst_offset + nb_samples;
dst_move_size = dst->nb_samples - dst_offset;
for (p = 0; p < src->planes; p++) {
if (dst_move_size > 0) {
memmove(dst->data[p] + dst_offset2 * dst->stride,
dst->data[p] + dst_offset * dst->stride,
dst_move_size * dst->stride);
}
memcpy(dst->data[p] + dst_offset * dst->stride,
src->data[p] + src_offset * src->stride,
nb_samples * src->stride);
}
dst->nb_samples += nb_samples;
return 0;
}
void ff_audio_data_drain(AudioData *a, int nb_samples)
{
if (a->nb_samples <= nb_samples) {
/* drain the whole buffer */
a->nb_samples = 0;
} else {
int p;
int move_offset = a->stride * nb_samples;
int move_size = a->stride * (a->nb_samples - nb_samples);
for (p = 0; p < a->planes; p++)
memmove(a->data[p], a->data[p] + move_offset, move_size);
a->nb_samples -= nb_samples;
}
}
int ff_audio_data_add_to_fifo(AVAudioFifo *af, AudioData *a, int offset,
int nb_samples)
{
uint8_t *offset_data[AVRESAMPLE_MAX_CHANNELS];
int offset_size, p;
if (offset >= a->nb_samples)
return 0;
offset_size = offset * a->stride;
for (p = 0; p < a->planes; p++)
offset_data[p] = a->data[p] + offset_size;
return av_audio_fifo_write(af, (void **)offset_data, nb_samples);
}
int ff_audio_data_read_from_fifo(AVAudioFifo *af, AudioData *a, int nb_samples)
{
int ret;
if (a->read_only)
return AVERROR(EINVAL);
ret = ff_audio_data_realloc(a, nb_samples);
if (ret < 0)
return ret;
ret = av_audio_fifo_read(af, (void **)a->data, nb_samples);
if (ret >= 0)
a->nb_samples = ret;
return ret;
}
Jump to Line
Something went wrong with that request. Please try again.