diff options
Diffstat (limited to 'audio/aframe.c')
| -rw-r--r-- | audio/aframe.c | 444 |
1 files changed, 444 insertions, 0 deletions
diff --git a/audio/aframe.c b/audio/aframe.c new file mode 100644 index 0000000000..5178c718b4 --- /dev/null +++ b/audio/aframe.c @@ -0,0 +1,444 @@ +/* + * 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 "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 = frame->av_frame->format; + if (av_format == AV_SAMPLE_FMT_NONE && frame->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; +} |