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![Andreas Rheinhardt](/assets/img/avatar_default.png)
The documentation does not require the packet to be blank in this case (i.e. it can now contain opaque_ref), but it does contain that the contents will be reset upon success. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
558 lines
13 KiB
C
558 lines
13 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 "config.h"
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#include "libavutil/avassert.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 "libavutil/avstring.h"
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#include "libavutil/bprint.h"
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#include "bsf.h"
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#include "bsf_internal.h"
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#include "codec_desc.h"
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#include "codec_par.h"
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#define IS_EMPTY(pkt) (!(pkt)->data && !(pkt)->side_data_elems)
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typedef struct FFBSFContext {
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AVBSFContext pub;
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AVPacket *buffer_pkt;
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int eof;
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} FFBSFContext;
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static av_always_inline FFBSFContext *ffbsfcontext(AVBSFContext *ctx)
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{
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return (FFBSFContext *)ctx;
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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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FFBSFContext *bsfi;
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if (!pctx || !*pctx)
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return;
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ctx = *pctx;
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bsfi = ffbsfcontext(ctx);
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if (ctx->priv_data) {
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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)
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av_opt_free(ctx->priv_data);
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av_freep(&ctx->priv_data);
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}
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av_packet_free(&bsfi->buffer_pkt);
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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 char *bsf_to_name(void *bsf)
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{
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return ((AVBSFContext *)bsf)->filter->name;
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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 = bsf_to_name,
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.version = LIBAVUTIL_VERSION_INT,
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.child_next = bsf_child_next,
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.child_class_iterate = ff_bsf_child_class_iterate,
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.category = AV_CLASS_CATEGORY_BITSTREAM_FILTER,
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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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FFBSFContext *bsfi;
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int ret;
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bsfi = av_mallocz(sizeof(*bsfi));
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if (!bsfi)
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return AVERROR(ENOMEM);
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ctx = &bsfi->pub;
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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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/* 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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bsfi->buffer_pkt = av_packet_alloc();
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if (!bsfi->buffer_pkt) {
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ret = AVERROR(ENOMEM);
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goto fail;
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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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enum AVCodecID codec_id = ctx->filter->codec_ids[i];
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av_log(ctx, AV_LOG_ERROR, "%s (%d) ",
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avcodec_get_name(codec_id), codec_id);
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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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void av_bsf_flush(AVBSFContext *ctx)
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{
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FFBSFContext *const bsfi = ffbsfcontext(ctx);
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bsfi->eof = 0;
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av_packet_unref(bsfi->buffer_pkt);
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if (ctx->filter->flush)
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ctx->filter->flush(ctx);
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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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FFBSFContext *const bsfi = ffbsfcontext(ctx);
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int ret;
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if (!pkt || IS_EMPTY(pkt)) {
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if (pkt)
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av_packet_unref(pkt);
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bsfi->eof = 1;
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return 0;
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}
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if (bsfi->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 (!IS_EMPTY(bsfi->buffer_pkt))
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return AVERROR(EAGAIN);
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ret = av_packet_make_refcounted(pkt);
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if (ret < 0)
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return ret;
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av_packet_move_ref(bsfi->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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FFBSFContext *const bsfi = ffbsfcontext(ctx);
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AVPacket *tmp_pkt;
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if (bsfi->eof)
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return AVERROR_EOF;
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if (IS_EMPTY(bsfi->buffer_pkt))
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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 = bsfi->buffer_pkt;
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bsfi->buffer_pkt = tmp_pkt;
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return 0;
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}
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int ff_bsf_get_packet_ref(AVBSFContext *ctx, AVPacket *pkt)
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{
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FFBSFContext *const bsfi = ffbsfcontext(ctx);
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if (bsfi->eof)
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return AVERROR_EOF;
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if (IS_EMPTY(bsfi->buffer_pkt))
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return AVERROR(EAGAIN);
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av_packet_move_ref(pkt, bsfi->buffer_pkt);
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return 0;
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}
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typedef struct BSFListContext {
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const AVClass *class;
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AVBSFContext **bsfs;
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int nb_bsfs;
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unsigned idx; // index of currently processed BSF
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char * item_name;
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} BSFListContext;
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static int bsf_list_init(AVBSFContext *bsf)
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{
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BSFListContext *lst = bsf->priv_data;
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int ret, i;
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const AVCodecParameters *cod_par = bsf->par_in;
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AVRational tb = bsf->time_base_in;
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for (i = 0; i < lst->nb_bsfs; ++i) {
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ret = avcodec_parameters_copy(lst->bsfs[i]->par_in, cod_par);
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if (ret < 0)
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goto fail;
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lst->bsfs[i]->time_base_in = tb;
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ret = av_bsf_init(lst->bsfs[i]);
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if (ret < 0)
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goto fail;
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cod_par = lst->bsfs[i]->par_out;
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tb = lst->bsfs[i]->time_base_out;
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}
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bsf->time_base_out = tb;
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ret = avcodec_parameters_copy(bsf->par_out, cod_par);
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fail:
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return ret;
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}
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static int bsf_list_filter(AVBSFContext *bsf, AVPacket *out)
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{
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BSFListContext *lst = bsf->priv_data;
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int ret, eof = 0;
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if (!lst->nb_bsfs)
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return ff_bsf_get_packet_ref(bsf, out);
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while (1) {
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/* get a packet from the previous filter up the chain */
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if (lst->idx)
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ret = av_bsf_receive_packet(lst->bsfs[lst->idx-1], out);
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else
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ret = ff_bsf_get_packet_ref(bsf, out);
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if (ret == AVERROR(EAGAIN)) {
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if (!lst->idx)
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return ret;
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lst->idx--;
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continue;
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} else if (ret == AVERROR_EOF) {
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eof = 1;
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} else if (ret < 0)
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return ret;
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/* send it to the next filter down the chain */
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if (lst->idx < lst->nb_bsfs) {
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ret = av_bsf_send_packet(lst->bsfs[lst->idx], eof ? NULL : out);
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av_assert1(ret != AVERROR(EAGAIN));
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if (ret < 0) {
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av_packet_unref(out);
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return ret;
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}
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lst->idx++;
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eof = 0;
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} else if (eof) {
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return ret;
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} else {
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return 0;
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}
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}
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}
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static void bsf_list_flush(AVBSFContext *bsf)
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{
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BSFListContext *lst = bsf->priv_data;
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for (int i = 0; i < lst->nb_bsfs; i++)
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av_bsf_flush(lst->bsfs[i]);
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lst->idx = 0;
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}
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static void bsf_list_close(AVBSFContext *bsf)
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{
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BSFListContext *lst = bsf->priv_data;
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int i;
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for (i = 0; i < lst->nb_bsfs; ++i)
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av_bsf_free(&lst->bsfs[i]);
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av_freep(&lst->bsfs);
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av_freep(&lst->item_name);
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}
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static const char *bsf_list_item_name(void *ctx)
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{
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static const char *null_filter_name = "null";
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AVBSFContext *bsf_ctx = ctx;
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BSFListContext *lst = bsf_ctx->priv_data;
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if (!lst->nb_bsfs)
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return null_filter_name;
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if (!lst->item_name) {
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int i;
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AVBPrint bp;
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av_bprint_init(&bp, 16, 128);
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av_bprintf(&bp, "bsf_list(");
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for (i = 0; i < lst->nb_bsfs; i++)
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av_bprintf(&bp, i ? ",%s" : "%s", lst->bsfs[i]->filter->name);
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av_bprintf(&bp, ")");
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av_bprint_finalize(&bp, &lst->item_name);
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}
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return lst->item_name;
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}
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static const AVClass bsf_list_class = {
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.class_name = "bsf_list",
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.item_name = bsf_list_item_name,
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.version = LIBAVUTIL_VERSION_INT,
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};
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static const AVBitStreamFilter list_bsf = {
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.name = "bsf_list",
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.priv_data_size = sizeof(BSFListContext),
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.priv_class = &bsf_list_class,
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.init = bsf_list_init,
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.filter = bsf_list_filter,
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.flush = bsf_list_flush,
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.close = bsf_list_close,
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};
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struct AVBSFList {
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AVBSFContext **bsfs;
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int nb_bsfs;
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};
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AVBSFList *av_bsf_list_alloc(void)
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{
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return av_mallocz(sizeof(AVBSFList));
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}
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void av_bsf_list_free(AVBSFList **lst)
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{
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int i;
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if (!*lst)
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return;
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for (i = 0; i < (*lst)->nb_bsfs; ++i)
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av_bsf_free(&(*lst)->bsfs[i]);
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av_free((*lst)->bsfs);
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av_freep(lst);
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}
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int av_bsf_list_append(AVBSFList *lst, AVBSFContext *bsf)
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{
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return av_dynarray_add_nofree(&lst->bsfs, &lst->nb_bsfs, bsf);
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}
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static int bsf_list_append_internal(AVBSFList *lst, const char *bsf_name, const char *options, AVDictionary ** options_dict)
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{
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int ret;
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const AVBitStreamFilter *filter;
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AVBSFContext *bsf;
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filter = av_bsf_get_by_name(bsf_name);
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if (!filter)
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return AVERROR_BSF_NOT_FOUND;
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ret = av_bsf_alloc(filter, &bsf);
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if (ret < 0)
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return ret;
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if (options && filter->priv_class) {
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const AVOption *opt = av_opt_next(bsf->priv_data, NULL);
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const char * shorthand[2] = {NULL};
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if (opt)
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shorthand[0] = opt->name;
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ret = av_opt_set_from_string(bsf->priv_data, options, shorthand, "=", ":");
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if (ret < 0)
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goto end;
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}
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if (options_dict) {
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ret = av_opt_set_dict2(bsf, options_dict, AV_OPT_SEARCH_CHILDREN);
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if (ret < 0)
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goto end;
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}
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ret = av_bsf_list_append(lst, bsf);
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end:
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if (ret < 0)
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av_bsf_free(&bsf);
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return ret;
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}
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int av_bsf_list_append2(AVBSFList *lst, const char *bsf_name, AVDictionary ** options)
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{
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return bsf_list_append_internal(lst, bsf_name, NULL, options);
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}
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int av_bsf_list_finalize(AVBSFList **lst, AVBSFContext **bsf)
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{
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int ret = 0;
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BSFListContext *ctx;
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if ((*lst)->nb_bsfs == 1) {
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*bsf = (*lst)->bsfs[0];
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av_freep(&(*lst)->bsfs);
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(*lst)->nb_bsfs = 0;
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goto end;
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}
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ret = av_bsf_alloc(&list_bsf, bsf);
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if (ret < 0)
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return ret;
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ctx = (*bsf)->priv_data;
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ctx->bsfs = (*lst)->bsfs;
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ctx->nb_bsfs = (*lst)->nb_bsfs;
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end:
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av_freep(lst);
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return ret;
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}
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static int bsf_parse_single(char *str, AVBSFList *bsf_lst)
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{
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char *bsf_name, *bsf_options_str;
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bsf_name = av_strtok(str, "=", &bsf_options_str);
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if (!bsf_name)
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return AVERROR(EINVAL);
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return bsf_list_append_internal(bsf_lst, bsf_name, bsf_options_str, NULL);
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}
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int av_bsf_list_parse_str(const char *str, AVBSFContext **bsf_lst)
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{
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AVBSFList *lst;
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int ret;
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if (!str)
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return av_bsf_get_null_filter(bsf_lst);
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lst = av_bsf_list_alloc();
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if (!lst)
|
|
return AVERROR(ENOMEM);
|
|
|
|
do {
|
|
char *bsf_str = av_get_token(&str, ",");
|
|
ret = bsf_parse_single(bsf_str, lst);
|
|
av_free(bsf_str);
|
|
if (ret < 0)
|
|
goto end;
|
|
} while (*str && *++str);
|
|
|
|
ret = av_bsf_list_finalize(&lst, bsf_lst);
|
|
end:
|
|
if (ret < 0)
|
|
av_bsf_list_free(&lst);
|
|
return ret;
|
|
}
|
|
|
|
int av_bsf_get_null_filter(AVBSFContext **bsf)
|
|
{
|
|
#if CONFIG_NULL_BSF
|
|
extern const AVBitStreamFilter ff_null_bsf;
|
|
return av_bsf_alloc(&ff_null_bsf, bsf);
|
|
#else
|
|
return av_bsf_alloc(&list_bsf, bsf);
|
|
#endif
|
|
}
|