mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-12 19:18:44 +02:00
ce5870a3a8
This makes it easier for users of the CBS API to get alloc/free right - all subelements use the buffer API so that it's clear how to free them. It also allows eliding some redundant copies: the packet -> fragment copy disappears after this change if the input packet is refcounted, and more codec-specific cases are now possible (but not included in this patch).
599 lines
15 KiB
C
599 lines
15 KiB
C
/*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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/buffer.h"
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#include "libavutil/common.h"
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#include "cbs.h"
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#include "cbs_internal.h"
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static const CodedBitstreamType *cbs_type_table[] = {
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#if CONFIG_CBS_H264
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&ff_cbs_type_h264,
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#endif
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#if CONFIG_CBS_H265
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&ff_cbs_type_h265,
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#endif
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#if CONFIG_CBS_MPEG2
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&ff_cbs_type_mpeg2,
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#endif
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};
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int ff_cbs_init(CodedBitstreamContext **ctx_ptr,
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enum AVCodecID codec_id, void *log_ctx)
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{
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CodedBitstreamContext *ctx;
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const CodedBitstreamType *type;
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int i;
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type = NULL;
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for (i = 0; i < FF_ARRAY_ELEMS(cbs_type_table); i++) {
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if (cbs_type_table[i]->codec_id == codec_id) {
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type = cbs_type_table[i];
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break;
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}
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}
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if (!type)
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return AVERROR(EINVAL);
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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->log_ctx = log_ctx;
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ctx->codec = type;
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ctx->priv_data = av_mallocz(ctx->codec->priv_data_size);
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if (!ctx->priv_data) {
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av_freep(&ctx);
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return AVERROR(ENOMEM);
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}
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ctx->decompose_unit_types = NULL;
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ctx->trace_enable = 0;
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ctx->trace_level = AV_LOG_TRACE;
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*ctx_ptr = ctx;
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return 0;
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}
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void ff_cbs_close(CodedBitstreamContext **ctx_ptr)
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{
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CodedBitstreamContext *ctx = *ctx_ptr;
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if (!ctx)
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return;
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if (ctx->codec && ctx->codec->close)
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ctx->codec->close(ctx);
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av_freep(&ctx->priv_data);
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av_freep(ctx_ptr);
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}
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static void cbs_unit_uninit(CodedBitstreamContext *ctx,
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CodedBitstreamUnit *unit)
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{
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av_buffer_unref(&unit->content_ref);
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unit->content = NULL;
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av_buffer_unref(&unit->data_ref);
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unit->data = NULL;
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unit->data_size = 0;
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unit->data_bit_padding = 0;
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}
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void ff_cbs_fragment_uninit(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag)
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{
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int i;
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for (i = 0; i < frag->nb_units; i++)
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cbs_unit_uninit(ctx, &frag->units[i]);
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av_freep(&frag->units);
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frag->nb_units = 0;
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av_buffer_unref(&frag->data_ref);
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frag->data = NULL;
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frag->data_size = 0;
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frag->data_bit_padding = 0;
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}
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static int cbs_read_fragment_content(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag)
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{
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int err, i, j;
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for (i = 0; i < frag->nb_units; i++) {
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if (ctx->decompose_unit_types) {
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for (j = 0; j < ctx->nb_decompose_unit_types; j++) {
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if (ctx->decompose_unit_types[j] == frag->units[i].type)
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break;
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}
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if (j >= ctx->nb_decompose_unit_types)
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continue;
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}
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av_buffer_unref(&frag->units[i].content_ref);
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frag->units[i].content = NULL;
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err = ctx->codec->read_unit(ctx, &frag->units[i]);
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if (err == AVERROR(ENOSYS)) {
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av_log(ctx->log_ctx, AV_LOG_VERBOSE,
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"Decomposition unimplemented for unit %d "
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"(type %"PRIu32").\n", i, frag->units[i].type);
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} else if (err < 0) {
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av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to read unit %d "
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"(type %"PRIu32").\n", i, frag->units[i].type);
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return err;
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}
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}
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return 0;
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}
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int ff_cbs_read_extradata(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag,
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const AVCodecParameters *par)
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{
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int err;
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memset(frag, 0, sizeof(*frag));
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frag->data = par->extradata;
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frag->data_size = par->extradata_size;
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err = ctx->codec->split_fragment(ctx, frag, 1);
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if (err < 0)
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return err;
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frag->data = NULL;
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frag->data_size = 0;
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return cbs_read_fragment_content(ctx, frag);
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}
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static int cbs_fill_fragment_data(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag,
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const uint8_t *data, size_t size)
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{
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av_assert0(!frag->data && !frag->data_ref);
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frag->data_ref =
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av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!frag->data_ref)
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return AVERROR(ENOMEM);
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frag->data = frag->data_ref->data;
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frag->data_size = size;
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memcpy(frag->data, data, size);
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memset(frag->data + size, 0,
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AV_INPUT_BUFFER_PADDING_SIZE);
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return 0;
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}
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int ff_cbs_read_packet(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag,
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const AVPacket *pkt)
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{
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int err;
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memset(frag, 0, sizeof(*frag));
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if (pkt->buf) {
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frag->data_ref = av_buffer_ref(pkt->buf);
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if (!frag->data_ref)
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return AVERROR(ENOMEM);
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frag->data = pkt->data;
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frag->data_size = pkt->size;
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} else {
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err = cbs_fill_fragment_data(ctx, frag, pkt->data, pkt->size);
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if (err < 0)
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return err;
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}
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err = ctx->codec->split_fragment(ctx, frag, 0);
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if (err < 0)
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return err;
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return cbs_read_fragment_content(ctx, frag);
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}
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int ff_cbs_read(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag,
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const uint8_t *data, size_t size)
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{
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int err;
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memset(frag, 0, sizeof(*frag));
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err = cbs_fill_fragment_data(ctx, frag, data, size);
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if (err < 0)
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return err;
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err = ctx->codec->split_fragment(ctx, frag, 0);
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if (err < 0)
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return err;
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return cbs_read_fragment_content(ctx, frag);
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}
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int ff_cbs_write_fragment_data(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag)
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{
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int err, i;
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for (i = 0; i < frag->nb_units; i++) {
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CodedBitstreamUnit *unit = &frag->units[i];
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if (!unit->content)
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continue;
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av_buffer_unref(&unit->data_ref);
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unit->data = NULL;
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err = ctx->codec->write_unit(ctx, unit);
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if (err < 0) {
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av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to write unit %d "
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"(type %"PRIu32").\n", i, unit->type);
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return err;
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}
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}
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av_buffer_unref(&frag->data_ref);
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frag->data = NULL;
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err = ctx->codec->assemble_fragment(ctx, frag);
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if (err < 0) {
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av_log(ctx->log_ctx, AV_LOG_ERROR, "Failed to assemble fragment.\n");
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return err;
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}
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return 0;
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}
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int ff_cbs_write_extradata(CodedBitstreamContext *ctx,
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AVCodecParameters *par,
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CodedBitstreamFragment *frag)
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{
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int err;
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err = ff_cbs_write_fragment_data(ctx, frag);
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if (err < 0)
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return err;
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av_freep(&par->extradata);
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par->extradata = av_malloc(frag->data_size +
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AV_INPUT_BUFFER_PADDING_SIZE);
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if (!par->extradata)
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return AVERROR(ENOMEM);
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memcpy(par->extradata, frag->data, frag->data_size);
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memset(par->extradata + frag->data_size, 0,
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AV_INPUT_BUFFER_PADDING_SIZE);
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par->extradata_size = frag->data_size;
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return 0;
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}
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int ff_cbs_write_packet(CodedBitstreamContext *ctx,
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AVPacket *pkt,
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CodedBitstreamFragment *frag)
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{
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int err;
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err = ff_cbs_write_fragment_data(ctx, frag);
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if (err < 0)
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return err;
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err = av_new_packet(pkt, frag->data_size);
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if (err < 0)
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return err;
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memcpy(pkt->data, frag->data, frag->data_size);
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pkt->size = frag->data_size;
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return 0;
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}
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void ff_cbs_trace_header(CodedBitstreamContext *ctx,
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const char *name)
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{
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if (!ctx->trace_enable)
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return;
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av_log(ctx->log_ctx, ctx->trace_level, "%s\n", name);
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}
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void ff_cbs_trace_syntax_element(CodedBitstreamContext *ctx, int position,
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const char *name, const char *bits,
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int64_t value)
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{
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size_t name_len, bits_len;
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int pad;
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if (!ctx->trace_enable)
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return;
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av_assert0(value >= INT_MIN && value <= UINT32_MAX);
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name_len = strlen(name);
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bits_len = strlen(bits);
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if (name_len + bits_len > 60)
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pad = bits_len + 2;
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else
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pad = 61 - name_len;
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av_log(ctx->log_ctx, ctx->trace_level, "%-10d %s%*s = %"PRId64"\n",
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position, name, pad, bits, value);
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}
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int ff_cbs_read_unsigned(CodedBitstreamContext *ctx, BitstreamContext *bc,
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int width, const char *name, uint32_t *write_to,
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uint32_t range_min, uint32_t range_max)
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{
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uint32_t value;
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int position;
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av_assert0(width <= 32);
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if (bitstream_bits_left(bc) < width) {
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av_log(ctx->log_ctx, AV_LOG_ERROR, "Invalid value at "
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"%s: bitstream ended.\n", name);
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return AVERROR_INVALIDDATA;
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}
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if (ctx->trace_enable)
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position = bitstream_tell(bc);
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value = bitstream_read(bc, width);
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if (ctx->trace_enable) {
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char bits[33];
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int i;
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for (i = 0; i < width; i++)
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bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
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bits[i] = 0;
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ff_cbs_trace_syntax_element(ctx, position, name, bits, value);
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}
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if (value < range_min || value > range_max) {
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av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
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"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
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name, value, range_min, range_max);
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return AVERROR_INVALIDDATA;
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}
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*write_to = value;
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return 0;
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}
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int ff_cbs_write_unsigned(CodedBitstreamContext *ctx, PutBitContext *pbc,
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int width, const char *name, uint32_t value,
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uint32_t range_min, uint32_t range_max)
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{
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av_assert0(width <= 32);
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if (value < range_min || value > range_max) {
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av_log(ctx->log_ctx, AV_LOG_ERROR, "%s out of range: "
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"%"PRIu32", but must be in [%"PRIu32",%"PRIu32"].\n",
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name, value, range_min, range_max);
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return AVERROR_INVALIDDATA;
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}
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if (put_bits_left(pbc) < width)
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return AVERROR(ENOSPC);
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if (ctx->trace_enable) {
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char bits[33];
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int i;
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for (i = 0; i < width; i++)
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bits[i] = value >> (width - i - 1) & 1 ? '1' : '0';
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bits[i] = 0;
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ff_cbs_trace_syntax_element(ctx, put_bits_count(pbc), name, bits, value);
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}
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if (width < 32)
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put_bits(pbc, width, value);
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else
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put_bits32(pbc, value);
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return 0;
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}
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int ff_cbs_alloc_unit_content(CodedBitstreamContext *ctx,
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CodedBitstreamUnit *unit,
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size_t size,
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void (*free)(void *opaque, uint8_t *data))
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{
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av_assert0(!unit->content && !unit->content_ref);
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unit->content = av_mallocz(size);
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if (!unit->content)
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return AVERROR(ENOMEM);
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unit->content_ref = av_buffer_create(unit->content, size,
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free, ctx, 0);
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if (!unit->content_ref) {
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av_freep(&unit->content);
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return AVERROR(ENOMEM);
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}
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return 0;
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}
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int ff_cbs_alloc_unit_data(CodedBitstreamContext *ctx,
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CodedBitstreamUnit *unit,
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size_t size)
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{
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av_assert0(!unit->data && !unit->data_ref);
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unit->data_ref = av_buffer_alloc(size + AV_INPUT_BUFFER_PADDING_SIZE);
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if (!unit->data_ref)
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return AVERROR(ENOMEM);
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unit->data = unit->data_ref->data;
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unit->data_size = size;
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memset(unit->data + size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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return 0;
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}
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static int cbs_insert_unit(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag,
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int position)
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{
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CodedBitstreamUnit *units;
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units = av_malloc_array(frag->nb_units + 1, sizeof(*units));
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if (!units)
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return AVERROR(ENOMEM);
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if (position > 0)
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memcpy(units, frag->units, position * sizeof(*units));
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if (position < frag->nb_units)
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memcpy(units + position + 1, frag->units + position,
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(frag->nb_units - position) * sizeof(*units));
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memset(units + position, 0, sizeof(*units));
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av_freep(&frag->units);
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frag->units = units;
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++frag->nb_units;
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return 0;
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}
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int ff_cbs_insert_unit_content(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag,
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int position,
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CodedBitstreamUnitType type,
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void *content,
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AVBufferRef *content_buf)
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{
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CodedBitstreamUnit *unit;
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AVBufferRef *content_ref;
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int err;
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if (position == -1)
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position = frag->nb_units;
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av_assert0(position >= 0 && position <= frag->nb_units);
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if (content_buf) {
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content_ref = av_buffer_ref(content_buf);
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if (!content_ref)
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return AVERROR(ENOMEM);
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} else {
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content_ref = NULL;
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}
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err = cbs_insert_unit(ctx, frag, position);
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if (err < 0) {
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av_buffer_unref(&content_ref);
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return err;
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}
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unit = &frag->units[position];
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unit->type = type;
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unit->content = content;
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unit->content_ref = content_ref;
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return 0;
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}
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int ff_cbs_insert_unit_data(CodedBitstreamContext *ctx,
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CodedBitstreamFragment *frag,
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int position,
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CodedBitstreamUnitType type,
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uint8_t *data, size_t data_size,
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AVBufferRef *data_buf)
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{
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CodedBitstreamUnit *unit;
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AVBufferRef *data_ref;
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int err;
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|
|
if (position == -1)
|
|
position = frag->nb_units;
|
|
av_assert0(position >= 0 && position <= frag->nb_units);
|
|
|
|
if (data_buf)
|
|
data_ref = av_buffer_ref(data_buf);
|
|
else
|
|
data_ref = av_buffer_create(data, data_size, NULL, NULL, 0);
|
|
if (!data_ref)
|
|
return AVERROR(ENOMEM);
|
|
|
|
err = cbs_insert_unit(ctx, frag, position);
|
|
if (err < 0) {
|
|
av_buffer_unref(&data_ref);
|
|
return err;
|
|
}
|
|
|
|
unit = &frag->units[position];
|
|
unit->type = type;
|
|
unit->data = data;
|
|
unit->data_size = data_size;
|
|
unit->data_ref = data_ref;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ff_cbs_delete_unit(CodedBitstreamContext *ctx,
|
|
CodedBitstreamFragment *frag,
|
|
int position)
|
|
{
|
|
if (position < 0 || position >= frag->nb_units)
|
|
return AVERROR(EINVAL);
|
|
|
|
cbs_unit_uninit(ctx, &frag->units[position]);
|
|
|
|
--frag->nb_units;
|
|
|
|
if (frag->nb_units == 0) {
|
|
av_freep(&frag->units);
|
|
|
|
} else {
|
|
memmove(frag->units + position,
|
|
frag->units + position + 1,
|
|
(frag->nb_units - position) * sizeof(*frag->units));
|
|
|
|
// Don't bother reallocating the unit array.
|
|
}
|
|
|
|
return 0;
|
|
}
|