diff options
Diffstat (limited to 'libavfilter/fifo.c')
| -rw-r--r-- | libavfilter/fifo.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/libavfilter/fifo.c b/libavfilter/fifo.c new file mode 100644 index 0000000000..da5aa648f6 --- /dev/null +++ b/libavfilter/fifo.c @@ -0,0 +1,152 @@ +/* + * 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 "audio.h" +#include "avfilter.h" +#include "internal.h" +#include "video.h" + +typedef struct Buf { + AVFilterBufferRef *buf; + struct Buf *next; +} Buf; + +typedef struct { + Buf root; + Buf *last; ///< last buffered frame +} FifoContext; + +static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque) +{ + FifoContext *fifo = ctx->priv; + fifo->last = &fifo->root; + + av_log(ctx, AV_LOG_INFO, "\n"); + 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; + avfilter_unref_buffer(buf->buf); + av_free(buf); + } +} + +static void add_to_queue(AVFilterLink *inlink, AVFilterBufferRef *buf) +{ + FifoContext *fifo = inlink->dst->priv; + + fifo->last->next = av_mallocz(sizeof(Buf)); + fifo->last = fifo->last->next; + fifo->last->buf = buf; +} + +static void end_frame(AVFilterLink *inlink) { } + +static void draw_slice(AVFilterLink *inlink, int y, int h, int slice_dir) { } + +static int request_frame(AVFilterLink *outlink) +{ + FifoContext *fifo = outlink->src->priv; + Buf *tmp; + int ret; + + if (!fifo->root.next) { + if ((ret = ff_request_frame(outlink->src->inputs[0])) < 0) + return ret; + } + + /* by doing this, we give ownership of the reference to the next filter, + * so we don't have to worry about dereferencing it ourselves. */ + switch (outlink->type) { + case AVMEDIA_TYPE_VIDEO: + ff_start_frame(outlink, fifo->root.next->buf); + ff_draw_slice (outlink, 0, outlink->h, 1); + ff_end_frame (outlink); + break; + case AVMEDIA_TYPE_AUDIO: + ff_filter_samples(outlink, fifo->root.next->buf); + break; + default: + return AVERROR(EINVAL); + } + + if (fifo->last == fifo->root.next) + fifo->last = &fifo->root; + tmp = fifo->root.next->next; + av_free(fifo->root.next); + fifo->root.next = tmp; + + return 0; +} + +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 = (const AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .get_video_buffer= ff_null_get_video_buffer, + .start_frame = add_to_queue, + .draw_slice = draw_slice, + .end_frame = end_frame, + .rej_perms = AV_PERM_REUSE2, }, + { .name = NULL}}, + .outputs = (const AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_VIDEO, + .request_frame = request_frame, }, + { .name = 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 = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .get_audio_buffer = ff_null_get_audio_buffer, + .filter_samples = add_to_queue, + .rej_perms = AV_PERM_REUSE2, }, + { .name = NULL}}, + .outputs = (AVFilterPad[]) {{ .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .request_frame = request_frame, }, + { .name = NULL}}, +}; |