/*
+ * 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.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; 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;
- uint8_t *sps_pps_data;
- uint32_t size;
+ int extradata_parsed;
} H264BSFContext;
-static void 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;
+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;
+ void *tmp;
- *poutbuf_size += sps_pps_size+in_size+nal_header_size;
- *poutbuf = av_realloc(*poutbuf, *poutbuf_size);
+ *poutbuf_size += sps_pps_size + in_size + nal_header_size;
+ tmp = av_realloc(*poutbuf, *poutbuf_size + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!tmp)
+ return AVERROR(ENOMEM);
+ *poutbuf = tmp;
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;
+ 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
+
+ if (length_size == 3)
+ return AVERROR(EINVAL);
+
+ /* retrieve sps and pps unit(s) */
+ unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
+ if (!unit_nb) {
+ unit_nb = *extradata++; /* number of pps unit(s) */
+ sps_done++;
+
+ if (unit_nb)
+ pps_seen = 1;
+ } else {
+ sps_seen = 1;
+ }
+
+ while (unit_nb--) {
+ void *tmp;
+
+ unit_size = AV_RB16(extradata);
+ total_size += unit_size + 4;
+ if (total_size > INT_MAX - padding ||
+ extradata + 2 + unit_size > avctx->extradata +
+ avctx->extradata_size) {
+ av_free(out);
+ return AVERROR(EINVAL);
+ }
+ tmp = av_realloc(out, total_size + padding);
+ if (!tmp) {
+ av_free(out);
+ return AVERROR(ENOMEM);
+ }
+ out = tmp;
+ memcpy(out + total_size - unit_size - 4, nalu_header, 4);
+ memcpy(out + total_size - unit_size, extradata + 2, unit_size);
+ extradata += 2 + unit_size;
+
+ 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) {
+ uint8_t **poutbuf, int *poutbuf_size,
+ const uint8_t *buf, int buf_size,
+ int keyframe)
+{
H264BSFContext *ctx = bsfc->priv_data;
uint8_t unit_type;
- uint32_t nal_size, cumul_size = 0;
+ 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 = (uint8_t *)buf;
*poutbuf_size = buf_size;
return 0;
}
/* retrieve sps and pps NAL units from extradata */
- if (!ctx->sps_pps_data) {
- uint16_t unit_size;
- uint32_t total_size = 0;
- uint8_t *out = NULL, unit_nb, sps_done = 0;
- const uint8_t *extradata = avctx->extradata+4;
- static const uint8_t nalu_header[4] = {0, 0, 0, 1};
-
- /* retrieve length coded size */
- ctx->length_size = (*extradata++ & 0x3) + 1;
- if (ctx->length_size == 3)
- return AVERROR(EINVAL);
-
- /* retrieve sps and pps unit(s) */
- unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
- if (!unit_nb) {
- unit_nb = *extradata++; /* number of pps unit(s) */
- sps_done++;
- }
- while (unit_nb--) {
- unit_size = AV_RB16(extradata);
- total_size += unit_size+4;
- if (extradata+2+unit_size > avctx->extradata+avctx->extradata_size) {
- av_free(out);
- return AVERROR(EINVAL);
- }
- out = av_realloc(out, total_size);
- if (!out)
- return AVERROR(ENOMEM);
- memcpy(out+total_size-unit_size-4, nalu_header, 4);
- memcpy(out+total_size-unit_size, extradata+2, unit_size);
- extradata += 2+unit_size;
-
- if (!unit_nb && !sps_done++)
- unit_nb = *extradata++; /* number of pps unit(s) */
- }
-
- ctx->sps_pps_data = out;
- ctx->size = total_size;
- ctx->first_idr = 1;
+ 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;
+ *poutbuf = NULL;
do {
- if (ctx->length_size == 1)
+ if (buf + ctx->length_size > buf_end)
+ goto fail;
+
+ if (ctx->length_size == 1) {
nal_size = buf[0];
- else if (ctx->length_size == 2)
+ } else if (ctx->length_size == 2) {
nal_size = AV_RB16(buf);
- else
+ } else
nal_size = AV_RB32(buf);
- buf += ctx->length_size;
+ 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) {
- alloc_and_copy(poutbuf, poutbuf_size,
- ctx->sps_pps_data, ctx->size,
- buf, nal_size);
+ if (alloc_and_copy(poutbuf, poutbuf_size,
+ avctx->extradata, avctx->extradata_size,
+ buf, nal_size) < 0)
+ goto fail;
ctx->first_idr = 0;
- }
- else {
- alloc_and_copy(poutbuf, poutbuf_size,
- NULL, 0,
- buf, nal_size);
+ } else {
+ if (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;
+ buf += nal_size;
cumul_size += nal_size + ctx->length_size;
} while (cumul_size < buf_size);
return 1;
-}
-static void h264_mp4toannexb_close(AVBitStreamFilterContext *bsfc)
-{
- H264BSFContext *ctx = bsfc->priv_data;
- av_freep(&ctx->sps_pps_data);
+fail:
+ av_freep(poutbuf);
+ *poutbuf_size = 0;
+ return AVERROR(EINVAL);
}
-AVBitStreamFilter h264_mp4toannexb_bsf = {
+AVBitStreamFilter ff_h264_mp4toannexb_bsf = {
"h264_mp4toannexb",
sizeof(H264BSFContext),
h264_mp4toannexb_filter,
- h264_mp4toannexb_close,
};
-