mpv/audio/aframe.c

446 lines
13 KiB
C

/*
* This file is part of mpv.
*
* mpv 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.
*
* mpv 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 mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <libavutil/frame.h>
#include <libavutil/mem.h>
#include "common/common.h"
#include "chmap.h"
#include "fmt-conversion.h"
#include "format.h"
#include "aframe.h"
struct mp_aframe {
AVFrame *av_frame;
// We support channel layouts different from AVFrame channel masks
struct mp_chmap chmap;
// We support spdif formats, which are allocated as AV_SAMPLE_FMT_S16.
int format;
double pts;
};
static void free_frame(void *ptr)
{
struct mp_aframe *frame = ptr;
av_frame_free(&frame->av_frame);
}
struct mp_aframe *mp_aframe_create(void)
{
struct mp_aframe *frame = talloc_zero(NULL, struct mp_aframe);
frame->pts = MP_NOPTS_VALUE;
frame->av_frame = av_frame_alloc();
if (!frame->av_frame)
abort();
talloc_set_destructor(frame, free_frame);
return frame;
}
struct mp_aframe *mp_aframe_new_ref(struct mp_aframe *frame)
{
if (!frame)
return NULL;
struct mp_aframe *dst = mp_aframe_create();
dst->chmap = frame->chmap;
dst->format = frame->format;
dst->pts = frame->pts;
if (mp_aframe_is_allocated(frame)) {
if (av_frame_ref(dst->av_frame, frame->av_frame) < 0)
abort();
} else {
// av_frame_ref() would fail.
mp_aframe_config_copy(dst, frame);
}
return dst;
}
// Revert to state after mp_aframe_create().
void mp_aframe_reset(struct mp_aframe *frame)
{
av_frame_unref(frame->av_frame);
frame->chmap.num = 0;
frame->format = 0;
frame->pts = MP_NOPTS_VALUE;
}
// Remove all actual audio data and leave only the metadata.
void mp_aframe_unref_data(struct mp_aframe *frame)
{
// In a fucked up way, this is less complex than just unreffing the data.
struct mp_aframe *tmp = mp_aframe_create();
MPSWAP(struct mp_aframe, *tmp, *frame);
mp_aframe_reset(frame);
mp_aframe_config_copy(frame, tmp);
talloc_free(tmp);
}
// Return a new reference to the data in av_frame. av_frame itself is not
// touched. Returns NULL if not representable, or if input is NULL.
// Does not copy the timestamps.
struct mp_aframe *mp_aframe_from_avframe(struct AVFrame *av_frame)
{
if (!av_frame || av_frame->width > 0 || av_frame->height > 0)
return NULL;
int format = af_from_avformat(av_frame->format);
if (!format && av_frame->format != AV_SAMPLE_FMT_NONE)
return NULL;
struct mp_aframe *frame = mp_aframe_create();
// This also takes care of forcing refcounting.
if (av_frame_ref(frame->av_frame, av_frame) < 0)
abort();
frame->format = format;
mp_chmap_from_lavc(&frame->chmap, frame->av_frame->channel_layout);
#if LIBAVUTIL_VERSION_MICRO >= 100
// FFmpeg being a stupid POS again
if (frame->chmap.num != frame->av_frame->channels)
mp_chmap_from_channels(&frame->chmap, av_frame->channels);
#endif
return frame;
}
// Return a new reference to the data in frame. Returns NULL is not
// representable (), or if input is NULL.
// Does not copy the timestamps.
struct AVFrame *mp_aframe_to_avframe(struct mp_aframe *frame)
{
if (!frame)
return NULL;
if (af_to_avformat(frame->format) != frame->av_frame->format)
return NULL;
if (!mp_chmap_is_lavc(&frame->chmap))
return NULL;
return av_frame_clone(frame->av_frame);
}
struct AVFrame *mp_aframe_to_avframe_and_unref(struct mp_aframe *frame)
{
AVFrame *av = mp_aframe_to_avframe(frame);
talloc_free(frame);
return av;
}
// You must not use this.
struct AVFrame *mp_aframe_get_raw_avframe(struct mp_aframe *frame)
{
return frame->av_frame;
}
// Return whether it has associated audio data. (If not, metadata only.)
bool mp_aframe_is_allocated(struct mp_aframe *frame)
{
return frame->av_frame->buf[0] || frame->av_frame->extended_data[0];
}
// Clear dst, and then copy the configuration to it.
void mp_aframe_config_copy(struct mp_aframe *dst, struct mp_aframe *src)
{
mp_aframe_reset(dst);
dst->chmap = src->chmap;
dst->format = src->format;
dst->pts = src->pts;
if (av_frame_copy_props(dst->av_frame, src->av_frame) < 0)
abort();
dst->av_frame->format = src->av_frame->format;
dst->av_frame->channel_layout = src->av_frame->channel_layout;
#if LIBAVUTIL_VERSION_MICRO >= 100
// FFmpeg being a stupid POS again
dst->av_frame->channels = src->av_frame->channels;
#endif
}
// Return whether a and b use the same physical audio format. Extra metadata
// such as PTS, per-frame signalling, and AVFrame side data is not compared.
bool mp_aframe_config_equals(struct mp_aframe *a, struct mp_aframe *b)
{
struct mp_chmap ca = {0}, cb = {0};
mp_aframe_get_chmap(a, &ca);
mp_aframe_get_chmap(b, &cb);
return mp_chmap_equals(&ca, &cb) &&
mp_aframe_get_rate(a) == mp_aframe_get_rate(b) &&
mp_aframe_get_format(a) == mp_aframe_get_format(b);
}
// Return whether all required format fields have been set.
bool mp_aframe_config_is_valid(struct mp_aframe *frame)
{
return frame->format && frame->chmap.num && frame->av_frame->sample_rate;
}
// Return the pointer to the first sample for each plane. The pointers stay
// valid until the next call that mutates frame somehow. You must not write to
// the audio data. Returns NULL if no frame allocated.
uint8_t **mp_aframe_get_data_ro(struct mp_aframe *frame)
{
return mp_aframe_is_allocated(frame) ? frame->av_frame->extended_data : NULL;
}
// Like mp_aframe_get_data_ro(), but you can write to the audio data.
// Additionally, it will return NULL if copy-on-write fails.
uint8_t **mp_aframe_get_data_rw(struct mp_aframe *frame)
{
if (!mp_aframe_is_allocated(frame))
return NULL;
if (av_frame_make_writable(frame->av_frame) < 0)
return NULL;
return frame->av_frame->extended_data;
}
int mp_aframe_get_format(struct mp_aframe *frame)
{
return frame->format;
}
bool mp_aframe_get_chmap(struct mp_aframe *frame, struct mp_chmap *out)
{
if (!mp_chmap_is_valid(&frame->chmap))
return false;
*out = frame->chmap;
return true;
}
int mp_aframe_get_channels(struct mp_aframe *frame)
{
return frame->chmap.num;
}
int mp_aframe_get_rate(struct mp_aframe *frame)
{
return frame->av_frame->sample_rate;
}
int mp_aframe_get_size(struct mp_aframe *frame)
{
return frame->av_frame->nb_samples;
}
double mp_aframe_get_pts(struct mp_aframe *frame)
{
return frame->pts;
}
bool mp_aframe_set_format(struct mp_aframe *frame, int format)
{
if (mp_aframe_is_allocated(frame))
return false;
enum AVSampleFormat av_format = af_to_avformat(format);
if (av_format == AV_SAMPLE_FMT_NONE && format) {
if (!af_fmt_is_spdif(format))
return false;
av_format = AV_SAMPLE_FMT_S16;
}
frame->format = format;
frame->av_frame->format = av_format;
return true;
}
bool mp_aframe_set_chmap(struct mp_aframe *frame, struct mp_chmap *in)
{
if (!mp_chmap_is_valid(in) && !mp_chmap_is_empty(in))
return false;
if (mp_aframe_is_allocated(frame) && in->num != frame->chmap.num)
return false;
uint64_t lavc_layout = mp_chmap_to_lavc_unchecked(in);
if (!lavc_layout && in->num)
return false;
frame->chmap = *in;
frame->av_frame->channel_layout = lavc_layout;
#if LIBAVUTIL_VERSION_MICRO >= 100
// FFmpeg being a stupid POS again
frame->av_frame->channels = frame->chmap.num;
#endif
return true;
}
bool mp_aframe_set_rate(struct mp_aframe *frame, int rate)
{
if (rate < 1 && rate > 10000000)
return false;
frame->av_frame->sample_rate = rate;
return true;
}
bool mp_aframe_set_size(struct mp_aframe *frame, int samples)
{
if (!mp_aframe_is_allocated(frame) || mp_aframe_get_size(frame) < samples)
return false;
frame->av_frame->nb_samples = MPMAX(samples, 0);
return true;
}
void mp_aframe_set_pts(struct mp_aframe *frame, double pts)
{
frame->pts = pts;
}
// Return number of data pointers.
int mp_aframe_get_planes(struct mp_aframe *frame)
{
return af_fmt_is_planar(mp_aframe_get_format(frame))
? mp_aframe_get_channels(frame) : 1;
}
// Return number of bytes between 2 consecutive samples on the same plane.
size_t mp_aframe_get_sstride(struct mp_aframe *frame)
{
int format = mp_aframe_get_format(frame);
return af_fmt_to_bytes(format) *
(af_fmt_is_planar(format) ? 1 : mp_aframe_get_channels(frame));
}
// Set data to the audio after the given number of samples (i.e. slice it).
void mp_aframe_skip_samples(struct mp_aframe *f, int samples)
{
assert(samples >= 0 && samples <= mp_aframe_get_size(f));
int num_planes = mp_aframe_get_planes(f);
size_t sstride = mp_aframe_get_sstride(f);
for (int n = 0; n < num_planes; n++)
f->av_frame->extended_data[n] += samples * sstride;
f->av_frame->nb_samples -= samples;
if (f->pts != MP_NOPTS_VALUE)
f->pts += samples / (double)mp_aframe_get_rate(f);
}
// Return the timestamp of the sample just after the end of this frame.
double mp_aframe_end_pts(struct mp_aframe *f)
{
int rate = mp_aframe_get_rate(f);
if (f->pts == MP_NOPTS_VALUE || rate < 1)
return MP_NOPTS_VALUE;
return f->pts + f->av_frame->nb_samples / (double)rate;
}
// Return the duration in seconds of the frame (0 if invalid).
double mp_aframe_duration(struct mp_aframe *f)
{
int rate = mp_aframe_get_rate(f);
if (rate < 1)
return 0;
return f->av_frame->nb_samples / (double)rate;
}
// Clip the given frame to the given timestamp range. Adjusts the frame size
// and timestamp.
void mp_aframe_clip_timestamps(struct mp_aframe *f, double start, double end)
{
double f_end = mp_aframe_end_pts(f);
int rate = mp_aframe_get_rate(f);
if (f_end == MP_NOPTS_VALUE)
return;
if (end != MP_NOPTS_VALUE) {
if (f_end >= end) {
if (f->pts >= end) {
f->av_frame->nb_samples = 0;
} else {
int new = (end - f->pts) * rate;
f->av_frame->nb_samples = MPCLAMP(new, 0, f->av_frame->nb_samples);
}
}
}
if (start != MP_NOPTS_VALUE) {
if (f->pts < start) {
if (f_end <= start) {
f->av_frame->nb_samples = 0;
f->pts = f_end;
} else {
int skip = (start - f->pts) * rate;
skip = MPCLAMP(skip, 0, f->av_frame->nb_samples);
mp_aframe_skip_samples(f, skip);
}
}
}
}
struct mp_aframe_pool {
AVBufferPool *avpool;
int element_size;
};
struct mp_aframe_pool *mp_aframe_pool_create(void *ta_parent)
{
return talloc_zero(ta_parent, struct mp_aframe_pool);
}
static void mp_aframe_pool_destructor(void *p)
{
struct mp_aframe_pool *pool = p;
av_buffer_pool_uninit(&pool->avpool);
}
// Like mp_aframe_allocate(), but use the pool to allocate data.
int mp_aframe_pool_allocate(struct mp_aframe_pool *pool, struct mp_aframe *frame,
int samples)
{
int planes = mp_aframe_get_planes(frame);
size_t sstride = mp_aframe_get_sstride(frame);
int plane_size = MP_ALIGN_UP(sstride * MPMAX(samples, 1), 32);
int size = plane_size * planes;
if (size <= 0 || mp_aframe_is_allocated(frame))
return -1;
if (!pool->avpool || size > pool->element_size) {
size_t alloc = ta_calc_prealloc_elems(size);
if (alloc >= INT_MAX)
return -1;
av_buffer_pool_uninit(&pool->avpool);
pool->element_size = alloc;
pool->avpool = av_buffer_pool_init(pool->element_size, NULL);
if (!pool->avpool)
return -1;
talloc_set_destructor(pool, mp_aframe_pool_destructor);
}
// Yes, you have to do all this shit manually.
// At least it's less stupid than av_frame_get_buffer(), which just wipes
// the entire frame struct on error for no reason.
AVFrame *av_frame = frame->av_frame;
if (av_frame->extended_data != av_frame->data)
av_freep(&av_frame->extended_data); // sigh
av_frame->extended_data =
av_mallocz_array(planes, sizeof(av_frame->extended_data[0]));
if (!av_frame->extended_data)
abort();
av_frame->buf[0] = av_buffer_pool_get(pool->avpool);
if (!av_frame->buf[0])
return -1;
av_frame->linesize[0] = samples * sstride;
for (int n = 0; n < planes; n++)
av_frame->extended_data[n] = av_frame->buf[0]->data + n * plane_size;
av_frame->nb_samples = samples;
return 0;
}