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Diffstat (limited to 'ffmpeg/libavcodec/h264_mp4toannexb_bsf.c')
-rw-r--r--ffmpeg/libavcodec/h264_mp4toannexb_bsf.c208
1 files changed, 0 insertions, 208 deletions
diff --git a/ffmpeg/libavcodec/h264_mp4toannexb_bsf.c b/ffmpeg/libavcodec/h264_mp4toannexb_bsf.c
deleted file mode 100644
index 8c0fbb3..0000000
--- a/ffmpeg/libavcodec/h264_mp4toannexb_bsf.c
+++ /dev/null
@@ -1,208 +0,0 @@
-/*
- * H.264 MP4 to Annex B byte stream format filter
- * Copyright (c) 2007 Benoit Fouet <benoit.fouet@free.fr>
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-
-#include <string.h>
-
-#include "libavutil/intreadwrite.h"
-#include "libavutil/mem.h"
-#include "avcodec.h"
-
-typedef struct H264BSFContext {
- uint8_t length_size;
- uint8_t first_idr;
- int extradata_parsed;
-} H264BSFContext;
-
-static int alloc_and_copy(uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *sps_pps, uint32_t sps_pps_size,
- const uint8_t *in, uint32_t in_size)
-{
- uint32_t offset = *poutbuf_size;
- uint8_t nal_header_size = offset ? 3 : 4;
- int err;
-
- *poutbuf_size += sps_pps_size + in_size + nal_header_size;
- if ((err = av_reallocp(poutbuf,
- *poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE)) < 0) {
- *poutbuf_size = 0;
- return err;
- }
- if (sps_pps)
- memcpy(*poutbuf + offset, sps_pps, sps_pps_size);
- memcpy(*poutbuf + sps_pps_size + nal_header_size + offset, in, in_size);
- if (!offset) {
- AV_WB32(*poutbuf + sps_pps_size, 1);
- } else {
- (*poutbuf + offset + sps_pps_size)[0] =
- (*poutbuf + offset + sps_pps_size)[1] = 0;
- (*poutbuf + offset + sps_pps_size)[2] = 1;
- }
-
- return 0;
-}
-
-static int h264_extradata_to_annexb(AVCodecContext *avctx, const int padding)
-{
- uint16_t unit_size;
- uint64_t total_size = 0;
- uint8_t *out = NULL, unit_nb, sps_done = 0,
- sps_seen = 0, pps_seen = 0;
- const uint8_t *extradata = avctx->extradata + 4;
- static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
- int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size
-
- /* retrieve sps and pps unit(s) */
- unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
- if (!unit_nb) {
- goto pps;
- } else {
- sps_seen = 1;
- }
-
- while (unit_nb--) {
- int err;
-
- unit_size = AV_RB16(extradata);
- total_size += unit_size + 4;
- if (total_size > INT_MAX - padding) {
- av_log(avctx, AV_LOG_ERROR,
- "Too big extradata size, corrupted stream or invalid MP4/AVCC bitstream\n");
- av_free(out);
- return AVERROR(EINVAL);
- }
- if (extradata + 2 + unit_size > avctx->extradata + avctx->extradata_size) {
- av_log(avctx, AV_LOG_ERROR, "Packet header is not contained in global extradata, "
- "corrupted stream or invalid MP4/AVCC bitstream\n");
- av_free(out);
- return AVERROR(EINVAL);
- }
- if ((err = av_reallocp(&out, total_size + padding)) < 0)
- return err;
- memcpy(out + total_size - unit_size - 4, nalu_header, 4);
- memcpy(out + total_size - unit_size, extradata + 2, unit_size);
- extradata += 2 + unit_size;
-pps:
- if (!unit_nb && !sps_done++) {
- unit_nb = *extradata++; /* number of pps unit(s) */
- if (unit_nb)
- pps_seen = 1;
- }
- }
-
- if (out)
- memset(out + total_size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
-
- if (!sps_seen)
- av_log(avctx, AV_LOG_WARNING,
- "Warning: SPS NALU missing or invalid. "
- "The resulting stream may not play.\n");
-
- if (!pps_seen)
- av_log(avctx, AV_LOG_WARNING,
- "Warning: PPS NALU missing or invalid. "
- "The resulting stream may not play.\n");
-
- av_free(avctx->extradata);
- avctx->extradata = out;
- avctx->extradata_size = total_size;
-
- return length_size;
-}
-
-static int h264_mp4toannexb_filter(AVBitStreamFilterContext *bsfc,
- AVCodecContext *avctx, const char *args,
- uint8_t **poutbuf, int *poutbuf_size,
- const uint8_t *buf, int buf_size,
- int keyframe)
-{
- H264BSFContext *ctx = bsfc->priv_data;
- int i;
- uint8_t unit_type;
- int32_t nal_size;
- uint32_t cumul_size = 0;
- const uint8_t *buf_end = buf + buf_size;
- int ret = 0;
-
- /* nothing to filter */
- if (!avctx->extradata || avctx->extradata_size < 6) {
- *poutbuf = (uint8_t *)buf;
- *poutbuf_size = buf_size;
- return 0;
- }
-
- /* retrieve sps and pps NAL units from extradata */
- if (!ctx->extradata_parsed) {
- ret = h264_extradata_to_annexb(avctx, FF_INPUT_BUFFER_PADDING_SIZE);
- if (ret < 0)
- return ret;
- ctx->length_size = ret;
- ctx->first_idr = 1;
- ctx->extradata_parsed = 1;
- }
-
- *poutbuf_size = 0;
- *poutbuf = NULL;
- do {
- ret= AVERROR(EINVAL);
- if (buf + ctx->length_size > buf_end)
- goto fail;
-
- for (nal_size = 0, i = 0; i<ctx->length_size; i++)
- nal_size = (nal_size << 8) | buf[i];
-
- buf += ctx->length_size;
- unit_type = *buf & 0x1f;
-
- if (buf + nal_size > buf_end || nal_size < 0)
- goto fail;
-
- /* prepend only to the first type 5 NAL unit of an IDR picture */
- if (ctx->first_idr && unit_type == 5) {
- if ((ret=alloc_and_copy(poutbuf, poutbuf_size,
- avctx->extradata, avctx->extradata_size,
- buf, nal_size)) < 0)
- goto fail;
- ctx->first_idr = 0;
- } else {
- if ((ret=alloc_and_copy(poutbuf, poutbuf_size,
- NULL, 0, buf, nal_size)) < 0)
- goto fail;
- if (!ctx->first_idr && unit_type == 1)
- ctx->first_idr = 1;
- }
-
- buf += nal_size;
- cumul_size += nal_size + ctx->length_size;
- } while (cumul_size < buf_size);
-
- return 1;
-
-fail:
- av_freep(poutbuf);
- *poutbuf_size = 0;
- return ret;
-}
-
-AVBitStreamFilter ff_h264_mp4toannexb_bsf = {
- .name = "h264_mp4toannexb",
- .priv_data_size = sizeof(H264BSFContext),
- .filter = h264_mp4toannexb_filter,
-};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 14:37:57 +0000