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Diffstat (limited to 'ffmpeg1/libavfilter/fifo.c')
-rw-r--r--ffmpeg1/libavfilter/fifo.c305
1 files changed, 0 insertions, 305 deletions
diff --git a/ffmpeg1/libavfilter/fifo.c b/ffmpeg1/libavfilter/fifo.c
deleted file mode 100644
index 5153752..0000000
--- a/ffmpeg1/libavfilter/fifo.c
+++ /dev/null
@@ -1,305 +0,0 @@
-/*
- * Copyright (c) 2007 Bobby Bingham
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg 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.
- *
- * FFmpeg 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-/**
- * @file
- * FIFO buffering filter
- */
-
-#include "libavutil/avassert.h"
-#include "libavutil/channel_layout.h"
-#include "libavutil/common.h"
-#include "libavutil/mathematics.h"
-#include "libavutil/samplefmt.h"
-
-#include "audio.h"
-#include "avfilter.h"
-#include "internal.h"
-#include "video.h"
-
-typedef struct Buf {
- AVFrame *frame;
- struct Buf *next;
-} Buf;
-
-typedef struct {
- Buf root;
- Buf *last; ///< last buffered frame
-
- /**
- * When a specific number of output samples is requested, the partial
- * buffer is stored here
- */
- AVFrame *out;
- int allocated_samples; ///< number of samples out was allocated for
-} FifoContext;
-
-static av_cold int init(AVFilterContext *ctx, const char *args)
-{
- FifoContext *fifo = ctx->priv;
- fifo->last = &fifo->root;
-
- return 0;
-}
-
-static av_cold void uninit(AVFilterContext *ctx)
-{
- FifoContext *fifo = ctx->priv;
- Buf *buf, *tmp;
-
- for (buf = fifo->root.next; buf; buf = tmp) {
- tmp = buf->next;
- av_frame_free(&buf->frame);
- av_free(buf);
- }
-
- av_frame_free(&fifo->out);
-}
-
-static int add_to_queue(AVFilterLink *inlink, AVFrame *frame)
-{
- FifoContext *fifo = inlink->dst->priv;
-
- fifo->last->next = av_mallocz(sizeof(Buf));
- if (!fifo->last->next) {
- av_frame_free(&frame);
- return AVERROR(ENOMEM);
- }
-
- fifo->last = fifo->last->next;
- fifo->last->frame = frame;
-
- return 0;
-}
-
-static void queue_pop(FifoContext *s)
-{
- Buf *tmp = s->root.next->next;
- if (s->last == s->root.next)
- s->last = &s->root;
- av_freep(&s->root.next);
- s->root.next = tmp;
-}
-
-/**
- * Move data pointers and pts offset samples forward.
- */
-static void buffer_offset(AVFilterLink *link, AVFrame *frame,
- int offset)
-{
- int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
- int planar = av_sample_fmt_is_planar(link->format);
- int planes = planar ? nb_channels : 1;
- int block_align = av_get_bytes_per_sample(link->format) * (planar ? 1 : nb_channels);
- int i;
-
- av_assert0(frame->nb_samples > offset);
-
- for (i = 0; i < planes; i++)
- frame->extended_data[i] += block_align * offset;
- if (frame->data != frame->extended_data)
- memcpy(frame->data, frame->extended_data,
- FFMIN(planes, FF_ARRAY_ELEMS(frame->data)) * sizeof(*frame->data));
- frame->linesize[0] -= block_align*offset;
- frame->nb_samples -= offset;
-
- if (frame->pts != AV_NOPTS_VALUE) {
- frame->pts += av_rescale_q(offset, (AVRational){1, link->sample_rate},
- link->time_base);
- }
-}
-
-static int calc_ptr_alignment(AVFrame *frame)
-{
- int planes = av_sample_fmt_is_planar(frame->format) ?
- av_get_channel_layout_nb_channels(frame->channel_layout) : 1;
- int min_align = 128;
- int p;
-
- for (p = 0; p < planes; p++) {
- int cur_align = 128;
- while ((intptr_t)frame->extended_data[p] % cur_align)
- cur_align >>= 1;
- if (cur_align < min_align)
- min_align = cur_align;
- }
- return min_align;
-}
-
-static int return_audio_frame(AVFilterContext *ctx)
-{
- AVFilterLink *link = ctx->outputs[0];
- FifoContext *s = ctx->priv;
- AVFrame *head = s->root.next->frame;
- AVFrame *out;
- int ret;
-
- if (!s->out &&
- head->nb_samples >= link->request_samples &&
- calc_ptr_alignment(head) >= 32) {
- if (head->nb_samples == link->request_samples) {
- out = head;
- queue_pop(s);
- } else {
- out = av_frame_clone(head);
- if (!out)
- return AVERROR(ENOMEM);
-
- out->nb_samples = link->request_samples;
- buffer_offset(link, head, link->request_samples);
- }
- } else {
- int nb_channels = av_get_channel_layout_nb_channels(link->channel_layout);
-
- if (!s->out) {
- s->out = ff_get_audio_buffer(link, link->request_samples);
- if (!s->out)
- return AVERROR(ENOMEM);
-
- s->out->nb_samples = 0;
- s->out->pts = head->pts;
- s->allocated_samples = link->request_samples;
- } else if (link->request_samples != s->allocated_samples) {
- av_log(ctx, AV_LOG_ERROR, "request_samples changed before the "
- "buffer was returned.\n");
- return AVERROR(EINVAL);
- }
-
- while (s->out->nb_samples < s->allocated_samples) {
- int len = FFMIN(s->allocated_samples - s->out->nb_samples,
- head->nb_samples);
-
- av_samples_copy(s->out->extended_data, head->extended_data,
- s->out->nb_samples, 0, len, nb_channels,
- link->format);
- s->out->nb_samples += len;
-
- if (len == head->nb_samples) {
- av_frame_free(&head);
- queue_pop(s);
-
- if (!s->root.next &&
- (ret = ff_request_frame(ctx->inputs[0])) < 0) {
- if (ret == AVERROR_EOF) {
- av_samples_set_silence(s->out->extended_data,
- s->out->nb_samples,
- s->allocated_samples -
- s->out->nb_samples,
- nb_channels, link->format);
- s->out->nb_samples = s->allocated_samples;
- break;
- }
- return ret;
- }
- head = s->root.next->frame;
- } else {
- buffer_offset(link, head, len);
- }
- }
- out = s->out;
- s->out = NULL;
- }
- return ff_filter_frame(link, out);
-}
-
-static int request_frame(AVFilterLink *outlink)
-{
- FifoContext *fifo = outlink->src->priv;
- int ret = 0;
-
- if (!fifo->root.next) {
- if ((ret = ff_request_frame(outlink->src->inputs[0])) < 0)
- return ret;
- av_assert0(fifo->root.next);
- }
-
- if (outlink->request_samples) {
- return return_audio_frame(outlink->src);
- } else {
- ret = ff_filter_frame(outlink, fifo->root.next->frame);
- queue_pop(fifo);
- }
-
- return ret;
-}
-
-static const AVFilterPad avfilter_vf_fifo_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .get_video_buffer = ff_null_get_video_buffer,
- .filter_frame = add_to_queue,
- },
- { NULL }
-};
-
-static const AVFilterPad avfilter_vf_fifo_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .request_frame = request_frame,
- },
- { NULL }
-};
-
-AVFilter avfilter_vf_fifo = {
- .name = "fifo",
- .description = NULL_IF_CONFIG_SMALL("Buffer input images and send them when they are requested."),
-
- .init = init,
- .uninit = uninit,
-
- .priv_size = sizeof(FifoContext),
-
- .inputs = avfilter_vf_fifo_inputs,
- .outputs = avfilter_vf_fifo_outputs,
-};
-
-static const AVFilterPad avfilter_af_afifo_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_AUDIO,
- .get_audio_buffer = ff_null_get_audio_buffer,
- .filter_frame = add_to_queue,
- },
- { NULL }
-};
-
-static const AVFilterPad avfilter_af_afifo_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_AUDIO,
- .request_frame = request_frame,
- },
- { NULL }
-};
-
-AVFilter avfilter_af_afifo = {
- .name = "afifo",
- .description = NULL_IF_CONFIG_SMALL("Buffer input frames and send them when they are requested."),
-
- .init = init,
- .uninit = uninit,
-
- .priv_size = sizeof(FifoContext),
-
- .inputs = avfilter_af_afifo_inputs,
- .outputs = avfilter_af_afifo_outputs,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 16:35:20 +0000