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🎥 Command line media player
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161/* * 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 <stddef.h>#include <limits.h>#include <assert.h>
#include "common/common.h"
#include "chmap.h"#include "audio_buffer.h"#include "format.h"
struct mp_audio_buffer { int format; struct mp_chmap channels; int srate; int sstride; int num_planes; uint8_t *data[MP_NUM_CHANNELS]; int allocated; int num_samples;};
struct mp_audio_buffer *mp_audio_buffer_create(void *talloc_ctx){ return talloc_zero(talloc_ctx, struct mp_audio_buffer);}
// Reinitialize the buffer, set a new format, drop old data.// The audio data in fmt is not used, only the format.void mp_audio_buffer_reinit_fmt(struct mp_audio_buffer *ab, int format, const struct mp_chmap *channels, int srate){ for (int n = 0; n < MP_NUM_CHANNELS; n++) TA_FREEP(&ab->data[n]); ab->format = format; ab->channels = *channels; ab->srate = srate; ab->allocated = 0; ab->num_samples = 0; ab->sstride = af_fmt_to_bytes(ab->format); ab->num_planes = 1; if (af_fmt_is_planar(ab->format)) { ab->num_planes = ab->channels.num; } else { ab->sstride *= ab->channels.num; }}
// Make the total size of the internal buffer at least this number of samples.void mp_audio_buffer_preallocate_min(struct mp_audio_buffer *ab, int samples){ if (samples > ab->allocated) { for (int n = 0; n < ab->num_planes; n++) { ab->data[n] = talloc_realloc(ab, ab->data[n], char, ab->sstride * samples); } ab->allocated = samples; }}
// Get number of samples that can be written without forcing a resize of the// internal buffer.int mp_audio_buffer_get_write_available(struct mp_audio_buffer *ab){ return ab->allocated - ab->num_samples;}
// All integer parameters are in samples.// dst and src can overlap.static void copy_planes(struct mp_audio_buffer *ab, uint8_t **dst, int dst_offset, uint8_t **src, int src_offset, int length){ if (!length) return;
for (int n = 0; n < ab->num_planes; n++) { memmove((char *)dst[n] + dst_offset * ab->sstride, (char *)src[n] + src_offset * ab->sstride, length * ab->sstride); }}
// Append data to the end of the buffer.// If the buffer is not large enough, it is transparently resized.void mp_audio_buffer_append(struct mp_audio_buffer *ab, void **ptr, int samples){ mp_audio_buffer_preallocate_min(ab, ab->num_samples + samples); copy_planes(ab, ab->data, ab->num_samples, (uint8_t **)ptr, 0, samples); ab->num_samples += samples;}
// Prepend silence to the start of the buffer.void mp_audio_buffer_prepend_silence(struct mp_audio_buffer *ab, int samples){ assert(samples >= 0); mp_audio_buffer_preallocate_min(ab, ab->num_samples + samples); copy_planes(ab, ab->data, samples, ab->data, 0, ab->num_samples); ab->num_samples += samples; for (int n = 0; n < ab->num_planes; n++) af_fill_silence(ab->data[n], samples * ab->sstride, ab->format);}
void mp_audio_buffer_duplicate(struct mp_audio_buffer *ab, int samples){ assert(samples >= 0 && samples <= ab->num_samples); mp_audio_buffer_preallocate_min(ab, ab->num_samples + samples); copy_planes(ab, ab->data, ab->num_samples, ab->data, ab->num_samples - samples, samples); ab->num_samples += samples;}
// Get the start of the current readable buffer.void mp_audio_buffer_peek(struct mp_audio_buffer *ab, uint8_t ***ptr, int *samples){ *ptr = ab->data; *samples = ab->num_samples;}
// Skip leading samples. (Used with mp_audio_buffer_peek() to read data.)void mp_audio_buffer_skip(struct mp_audio_buffer *ab, int samples){ assert(samples >= 0 && samples <= ab->num_samples); copy_planes(ab, ab->data, 0, ab->data, samples, ab->num_samples - samples); ab->num_samples -= samples;}
void mp_audio_buffer_clear(struct mp_audio_buffer *ab){ ab->num_samples = 0;}
// Return number of buffered audio samplesint mp_audio_buffer_samples(struct mp_audio_buffer *ab){ return ab->num_samples;}
// Return amount of buffered audio in seconds.double mp_audio_buffer_seconds(struct mp_audio_buffer *ab){ return ab->num_samples / (double)ab->srate;}