From 150c9823e71a161e97003849cf8b2f55b21520bd Mon Sep 17 00:00:00 2001 From: Tim Redfern Date: Mon, 26 Aug 2013 15:10:18 +0100 Subject: adding ffmpeg specific version --- ffmpeg1/libavfilter/fifo.c | 305 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 305 insertions(+) create mode 100644 ffmpeg1/libavfilter/fifo.c (limited to 'ffmpeg1/libavfilter/fifo.c') diff --git a/ffmpeg1/libavfilter/fifo.c b/ffmpeg1/libavfilter/fifo.c new file mode 100644 index 0000000..5153752 --- /dev/null +++ b/ffmpeg1/libavfilter/fifo.c @@ -0,0 +1,305 @@ +/* + * 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, +}; -- cgit v1.2.3