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https://git.ffmpeg.org/ffmpeg.git
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f3ed484953
Just pass through the bitstream as is. This is the same as what is done for HEVC already.
246 lines
7.1 KiB
C
246 lines
7.1 KiB
C
/*
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* H.264 MP4 to Annex B byte stream format filter
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* Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
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*
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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 "libavutil/intreadwrite.h"
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#include "libavutil/mem.h"
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#include "avcodec.h"
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#include "bsf.h"
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typedef struct H264BSFContext {
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uint8_t length_size;
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uint8_t first_idr;
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int extradata_parsed;
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} H264BSFContext;
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static int alloc_and_copy(AVPacket *out,
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const uint8_t *sps_pps, uint32_t sps_pps_size,
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const uint8_t *in, uint32_t in_size)
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{
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uint32_t offset = out->size;
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uint8_t nal_header_size = offset ? 3 : 4;
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int err;
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err = av_grow_packet(out, sps_pps_size + in_size + nal_header_size);
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if (err < 0)
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return err;
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if (sps_pps)
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memcpy(out->data + offset, sps_pps, sps_pps_size);
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memcpy(out->data + sps_pps_size + nal_header_size + offset, in, in_size);
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if (!offset) {
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AV_WB32(out->data + sps_pps_size, 1);
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} else {
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(out->data + offset + sps_pps_size)[0] =
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(out->data + offset + sps_pps_size)[1] = 0;
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(out->data + offset + sps_pps_size)[2] = 1;
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}
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return 0;
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}
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static int h264_extradata_to_annexb(AVBSFContext *ctx, const int padding)
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{
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uint16_t unit_size;
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uint64_t total_size = 0;
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uint8_t *out = NULL, unit_nb, sps_done = 0,
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sps_seen = 0, pps_seen = 0;
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const uint8_t *extradata = ctx->par_in->extradata + 4;
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static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
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int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size
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if (length_size == 3)
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return AVERROR(EINVAL);
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/* retrieve sps and pps unit(s) */
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unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
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if (!unit_nb) {
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unit_nb = *extradata++; /* number of pps unit(s) */
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sps_done++;
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if (unit_nb)
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pps_seen = 1;
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} else {
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sps_seen = 1;
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}
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while (unit_nb--) {
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int err;
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unit_size = AV_RB16(extradata);
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total_size += unit_size + 4;
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if (total_size > INT_MAX - padding ||
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extradata + 2 + unit_size > ctx->par_in->extradata +
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ctx->par_in->extradata_size) {
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av_free(out);
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return AVERROR(EINVAL);
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}
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if ((err = av_reallocp(&out, total_size + padding)) < 0)
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return err;
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memcpy(out + total_size - unit_size - 4, nalu_header, 4);
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memcpy(out + total_size - unit_size, extradata + 2, unit_size);
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extradata += 2 + unit_size;
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if (!unit_nb && !sps_done++) {
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unit_nb = *extradata++; /* number of pps unit(s) */
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if (unit_nb)
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pps_seen = 1;
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}
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}
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if (out)
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memset(out + total_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
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if (!sps_seen)
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av_log(ctx, AV_LOG_WARNING,
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"Warning: SPS NALU missing or invalid. "
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"The resulting stream may not play.\n");
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if (!pps_seen)
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av_log(ctx, AV_LOG_WARNING,
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"Warning: PPS NALU missing or invalid. "
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"The resulting stream may not play.\n");
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av_freep(&ctx->par_out->extradata);
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ctx->par_out->extradata = out;
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ctx->par_out->extradata_size = total_size;
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return length_size;
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}
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static int h264_mp4toannexb_init(AVBSFContext *ctx)
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{
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H264BSFContext *s = ctx->priv_data;
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int extra_size = ctx->par_in->extradata_size;
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int ret;
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/* retrieve sps and pps NAL units from extradata */
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if (!extra_size ||
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(extra_size >= 3 && AV_RB24(ctx->par_in->extradata) == 1) ||
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(extra_size >= 4 && AV_RB32(ctx->par_in->extradata) == 1)) {
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av_log(ctx, AV_LOG_VERBOSE,
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"The input looks like it is Annex B already\n");
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} else if (extra_size >= 6) {
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ret = h264_extradata_to_annexb(ctx, AV_INPUT_BUFFER_PADDING_SIZE);
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if (ret < 0)
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return ret;
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s->length_size = ret;
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s->first_idr = 1;
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s->extradata_parsed = 1;
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} else {
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av_log(ctx, AV_LOG_ERROR, "Invalid extradata size: %d\n", extra_size);
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
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{
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H264BSFContext *s = ctx->priv_data;
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AVPacket *in;
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uint8_t unit_type;
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int32_t nal_size;
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uint32_t cumul_size = 0;
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const uint8_t *buf;
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const uint8_t *buf_end;
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int buf_size;
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int ret = 0;
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ret = ff_bsf_get_packet(ctx, &in);
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if (ret < 0)
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return ret;
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/* nothing to filter */
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if (!s->extradata_parsed) {
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av_packet_move_ref(out, in);
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av_packet_free(&in);
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return 0;
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}
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buf = in->data;
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buf_size = in->size;
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buf_end = in->data + in->size;
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do {
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if (buf + s->length_size > buf_end)
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goto fail;
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if (s->length_size == 1) {
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nal_size = buf[0];
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} else if (s->length_size == 2) {
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nal_size = AV_RB16(buf);
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} else
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nal_size = AV_RB32(buf);
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buf += s->length_size;
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unit_type = *buf & 0x1f;
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if (buf + nal_size > buf_end || nal_size < 0)
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goto fail;
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/* prepend only to the first type 5 NAL unit of an IDR picture */
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if (s->first_idr && unit_type == 5) {
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if (alloc_and_copy(out,
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ctx->par_out->extradata, ctx->par_out->extradata_size,
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buf, nal_size) < 0)
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goto fail;
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s->first_idr = 0;
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} else {
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if (alloc_and_copy(out,
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NULL, 0, buf, nal_size) < 0)
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goto fail;
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if (!s->first_idr && unit_type == 1)
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s->first_idr = 1;
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}
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buf += nal_size;
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cumul_size += nal_size + s->length_size;
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} while (cumul_size < buf_size);
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ret = av_packet_copy_props(out, in);
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if (ret < 0)
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goto fail;
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fail:
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if (ret < 0)
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av_packet_unref(out);
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av_packet_free(&in);
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return ret;
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}
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static const enum AVCodecID codec_ids[] = {
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AV_CODEC_ID_H264, AV_CODEC_ID_NONE,
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};
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const AVBitStreamFilter ff_h264_mp4toannexb_bsf = {
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.name = "h264_mp4toannexb",
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.priv_data_size = sizeof(H264BSFContext),
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.init = h264_mp4toannexb_init,
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.filter = h264_mp4toannexb_filter,
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.codec_ids = codec_ids,
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};
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