mirror of
https://github.com/FFmpeg/FFmpeg.git
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af9cac1be1
* commit '33d18982fa03feb061c8f744a4f0a9175c1f63ab': lavc: add a new bitstream filtering API Conversions-by: Hendrik Leppkes <h.leppkes@gmail.com> Conversions-by: Derek Buitenguis <derek.buitenhuis@gmail.com> Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
220 lines
5.7 KiB
C
220 lines
5.7 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "libavutil/log.h"
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#include "libavutil/mem.h"
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#include "libavutil/opt.h"
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#include "avcodec.h"
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#include "bsf.h"
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struct AVBSFInternal {
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AVPacket *buffer_pkt;
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int eof;
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};
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void av_bsf_free(AVBSFContext **pctx)
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{
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AVBSFContext *ctx;
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if (!pctx || !*pctx)
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return;
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ctx = *pctx;
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if (ctx->filter->close)
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ctx->filter->close(ctx);
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if (ctx->filter->priv_class && ctx->priv_data)
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av_opt_free(ctx->priv_data);
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av_opt_free(ctx);
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av_packet_free(&ctx->internal->buffer_pkt);
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av_freep(&ctx->internal);
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av_freep(&ctx->priv_data);
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avcodec_parameters_free(&ctx->par_in);
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avcodec_parameters_free(&ctx->par_out);
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av_freep(pctx);
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}
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static void *bsf_child_next(void *obj, void *prev)
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{
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AVBSFContext *ctx = obj;
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if (!prev && ctx->filter->priv_class)
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return ctx->priv_data;
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return NULL;
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}
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static const AVClass bsf_class = {
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.class_name = "AVBSFContext",
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.item_name = av_default_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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.child_next = bsf_child_next,
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.child_class_next = ff_bsf_child_class_next,
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};
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const AVClass *av_bsf_get_class(void)
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{
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return &bsf_class;
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}
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int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
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{
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AVBSFContext *ctx;
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int ret;
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ctx = av_mallocz(sizeof(*ctx));
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if (!ctx)
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return AVERROR(ENOMEM);
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ctx->av_class = &bsf_class;
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ctx->filter = filter;
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ctx->par_in = avcodec_parameters_alloc();
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ctx->par_out = avcodec_parameters_alloc();
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if (!ctx->par_in || !ctx->par_out) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ctx->internal = av_mallocz(sizeof(*ctx->internal));
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if (!ctx->internal) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ctx->internal->buffer_pkt = av_packet_alloc();
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if (!ctx->internal->buffer_pkt) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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av_opt_set_defaults(ctx);
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/* allocate priv data and init private options */
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if (filter->priv_data_size) {
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ctx->priv_data = av_mallocz(filter->priv_data_size);
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if (!ctx->priv_data) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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if (filter->priv_class) {
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*(const AVClass **)ctx->priv_data = filter->priv_class;
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av_opt_set_defaults(ctx->priv_data);
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}
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}
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*pctx = ctx;
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return 0;
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fail:
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av_bsf_free(&ctx);
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return ret;
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}
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int av_bsf_init(AVBSFContext *ctx)
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{
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int ret, i;
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/* check that the codec is supported */
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if (ctx->filter->codec_ids) {
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for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++)
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if (ctx->par_in->codec_id == ctx->filter->codec_ids[i])
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break;
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if (ctx->filter->codec_ids[i] == AV_CODEC_ID_NONE) {
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const AVCodecDescriptor *desc = avcodec_descriptor_get(ctx->par_in->codec_id);
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av_log(ctx, AV_LOG_ERROR, "Codec '%s' (%d) is not supported by the "
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"bitstream filter '%s'. Supported codecs are: ",
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desc ? desc->name : "unknown", ctx->par_in->codec_id, ctx->filter->name);
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for (i = 0; ctx->filter->codec_ids[i] != AV_CODEC_ID_NONE; i++) {
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desc = avcodec_descriptor_get(ctx->filter->codec_ids[i]);
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av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
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desc ? desc->name : "unknown", ctx->filter->codec_ids[i]);
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}
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av_log(ctx, AV_LOG_ERROR, "\n");
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return AVERROR(EINVAL);
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}
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}
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/* initialize output parameters to be the same as input
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* init below might overwrite that */
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ret = avcodec_parameters_copy(ctx->par_out, ctx->par_in);
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if (ret < 0)
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return ret;
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ctx->time_base_out = ctx->time_base_in;
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if (ctx->filter->init) {
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ret = ctx->filter->init(ctx);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
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{
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if (!pkt || !pkt->data) {
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ctx->internal->eof = 1;
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return 0;
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}
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if (ctx->internal->eof) {
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av_log(ctx, AV_LOG_ERROR, "A non-NULL packet sent after an EOF.\n");
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return AVERROR(EINVAL);
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}
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if (ctx->internal->buffer_pkt->data ||
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ctx->internal->buffer_pkt->side_data_elems)
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return AVERROR(EAGAIN);
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av_packet_move_ref(ctx->internal->buffer_pkt, pkt);
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return 0;
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}
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int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
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{
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return ctx->filter->filter(ctx, pkt);
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}
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int ff_bsf_get_packet(AVBSFContext *ctx, AVPacket **pkt)
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{
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AVBSFInternal *in = ctx->internal;
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AVPacket *tmp_pkt;
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if (in->eof)
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return AVERROR_EOF;
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if (!ctx->internal->buffer_pkt->data &&
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!ctx->internal->buffer_pkt->side_data_elems)
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return AVERROR(EAGAIN);
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tmp_pkt = av_packet_alloc();
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if (!tmp_pkt)
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return AVERROR(ENOMEM);
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*pkt = ctx->internal->buffer_pkt;
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ctx->internal->buffer_pkt = tmp_pkt;
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return 0;
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}
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