#include <string.h>
+#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bsf.h"
+#include "bsf_internal.h"
+#include "bytestream.h"
#include "h264.h"
typedef struct H264BSFContext {
- int32_t sps_offset;
- int32_t pps_offset;
+ uint8_t *sps;
+ uint8_t *pps;
+ int sps_size;
+ int pps_size;
uint8_t length_size;
uint8_t new_idr;
uint8_t idr_sps_seen;
int extradata_parsed;
} H264BSFContext;
-static int alloc_and_copy(AVPacket *out,
- const uint8_t *sps_pps, uint32_t sps_pps_size,
- const uint8_t *in, uint32_t in_size, int ps)
+static void count_or_copy(uint8_t **out, uint64_t *out_size,
+ const uint8_t *in, int in_size, int ps, int copy)
{
- uint32_t offset = out->size;
- uint8_t start_code_size = offset == 0 || ps ? 4 : 3;
- int err;
-
- err = av_grow_packet(out, sps_pps_size + in_size + start_code_size);
- if (err < 0)
- return err;
-
- if (sps_pps)
- memcpy(out->data + offset, sps_pps, sps_pps_size);
- memcpy(out->data + sps_pps_size + start_code_size + offset, in, in_size);
- if (start_code_size == 4) {
- AV_WB32(out->data + offset + sps_pps_size, 1);
- } else {
- (out->data + offset + sps_pps_size)[0] =
- (out->data + offset + sps_pps_size)[1] = 0;
- (out->data + offset + sps_pps_size)[2] = 1;
+ uint8_t start_code_size = ps < 0 ? 0 : *out_size == 0 || ps ? 4 : 3;
+
+ if (copy) {
+ memcpy(*out + start_code_size, in, in_size);
+ if (start_code_size == 4) {
+ AV_WB32(*out, 1);
+ } else if (start_code_size) {
+ (*out)[0] =
+ (*out)[1] = 0;
+ (*out)[2] = 1;
+ }
+ *out += start_code_size + in_size;
}
-
- return 0;
+ *out_size += start_code_size + in_size;
}
static int h264_extradata_to_annexb(AVBSFContext *ctx, const int padding)
{
H264BSFContext *s = ctx->priv_data;
+ GetByteContext ogb, *gb = &ogb;
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 = ctx->par_in->extradata + 4;
+ uint32_t total_size = 0;
+ uint8_t *out = NULL, unit_nb, sps_done = 0;
static const uint8_t nalu_header[4] = { 0, 0, 0, 1 };
- int length_size = (*extradata++ & 0x3) + 1; // retrieve length coded size
+ int length_size, pps_offset = 0;
- s->sps_offset = s->pps_offset = -1;
+ bytestream2_init(gb, ctx->par_in->extradata, ctx->par_in->extradata_size);
+
+ bytestream2_skipu(gb, 4);
+
+ /* retrieve length coded size */
+ length_size = (bytestream2_get_byteu(gb) & 0x3) + 1;
/* retrieve sps and pps unit(s) */
- unit_nb = *extradata++ & 0x1f; /* number of sps unit(s) */
+ unit_nb = bytestream2_get_byteu(gb) & 0x1f; /* number of sps unit(s) */
if (!unit_nb) {
goto pps;
- } else {
- s->sps_offset = 0;
- sps_seen = 1;
}
while (unit_nb--) {
int err;
- unit_size = AV_RB16(extradata);
+ /* possible overread ok due to padding */
+ unit_size = bytestream2_get_be16u(gb);
total_size += unit_size + 4;
- if (total_size > INT_MAX - padding) {
- av_log(ctx, 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 > ctx->par_in->extradata + ctx->par_in->extradata_size) {
- av_log(ctx, AV_LOG_ERROR, "Packet header is not contained in global extradata, "
+ av_assert1(total_size <= INT_MAX - padding);
+ if (bytestream2_get_bytes_left(gb) < unit_size + !sps_done) {
+ av_log(ctx, AV_LOG_ERROR, "Global extradata truncated, "
"corrupted stream or invalid MP4/AVCC bitstream\n");
av_free(out);
- return AVERROR(EINVAL);
+ return AVERROR_INVALIDDATA;
}
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;
+ bytestream2_get_bufferu(gb, out + total_size - unit_size, unit_size);
pps:
if (!unit_nb && !sps_done++) {
- unit_nb = *extradata++; /* number of pps unit(s) */
- if (unit_nb) {
- s->pps_offset = total_size;
- pps_seen = 1;
- }
+ unit_nb = bytestream2_get_byteu(gb); /* number of pps unit(s) */
+ pps_offset = total_size;
}
}
if (out)
memset(out + total_size, 0, padding);
- if (!sps_seen)
+ if (pps_offset) {
+ s->sps = out;
+ s->sps_size = pps_offset;
+ } else {
av_log(ctx, AV_LOG_WARNING,
"Warning: SPS NALU missing or invalid. "
"The resulting stream may not play.\n");
-
- if (!pps_seen)
+ }
+ if (pps_offset < total_size) {
+ s->pps = out + pps_offset;
+ s->pps_size = total_size - pps_offset;
+ } else {
av_log(ctx, AV_LOG_WARNING,
"Warning: PPS NALU missing or invalid. "
"The resulting stream may not play.\n");
+ }
av_freep(&ctx->par_out->extradata);
ctx->par_out->extradata = out;
(extra_size >= 4 && AV_RB32(ctx->par_in->extradata) == 1)) {
av_log(ctx, AV_LOG_VERBOSE,
"The input looks like it is Annex B already\n");
- } else if (extra_size >= 6) {
+ } else if (extra_size >= 7) {
ret = h264_extradata_to_annexb(ctx, AV_INPUT_BUFFER_PADDING_SIZE);
if (ret < 0)
return ret;
return 0;
}
-static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *out)
+static int h264_mp4toannexb_filter(AVBSFContext *ctx, AVPacket *opkt)
{
H264BSFContext *s = ctx->priv_data;
-
AVPacket *in;
- uint8_t unit_type;
- int32_t nal_size;
- uint32_t cumul_size = 0;
+ uint8_t unit_type, new_idr, sps_seen, pps_seen;
const uint8_t *buf;
const uint8_t *buf_end;
- int buf_size;
- int ret = 0, i;
+ uint8_t *out;
+ uint64_t out_size;
+ int ret;
ret = ff_bsf_get_packet(ctx, &in);
if (ret < 0)
/* nothing to filter */
if (!s->extradata_parsed) {
- av_packet_move_ref(out, in);
+ av_packet_move_ref(opkt, in);
av_packet_free(&in);
return 0;
}
- buf = in->data;
- buf_size = in->size;
buf_end = in->data + in->size;
- do {
- ret= AVERROR(EINVAL);
- if (buf + s->length_size > buf_end)
- goto fail;
-
- for (nal_size = 0, i = 0; i<s->length_size; i++)
- nal_size = (nal_size << 8) | buf[i];
-
- buf += s->length_size;
- unit_type = *buf & 0x1f;
-
- if (nal_size > buf_end - buf || nal_size < 0)
- goto fail;
-
- if (unit_type == H264_NAL_SPS)
- s->idr_sps_seen = s->new_idr = 1;
- else if (unit_type == H264_NAL_PPS) {
- s->idr_pps_seen = s->new_idr = 1;
- /* if SPS has not been seen yet, prepend the AVCC one to PPS */
- if (!s->idr_sps_seen) {
- if (s->sps_offset == -1)
- av_log(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
- else {
- if ((ret = alloc_and_copy(out,
- ctx->par_out->extradata + s->sps_offset,
- s->pps_offset != -1 ? s->pps_offset : ctx->par_out->extradata_size - s->sps_offset,
- buf, nal_size, 1)) < 0)
- goto fail;
- s->idr_sps_seen = 1;
- goto next_nal;
+#define LOG_ONCE(...) \
+ if (j) \
+ av_log(__VA_ARGS__)
+ for (int j = 0; j < 2; j++) {
+ buf = in->data;
+ new_idr = s->new_idr;
+ sps_seen = s->idr_sps_seen;
+ pps_seen = s->idr_pps_seen;
+ out_size = 0;
+
+ do {
+ uint32_t nal_size = 0;
+
+ /* possible overread ok due to padding */
+ for (int i = 0; i < s->length_size; i++)
+ nal_size = (nal_size << 8) | buf[i];
+
+ buf += s->length_size;
+
+ /* This check requires the cast as the right side might
+ * otherwise be promoted to an unsigned value. */
+ if ((int64_t)nal_size > buf_end - buf) {
+ ret = AVERROR_INVALIDDATA;
+ goto fail;
+ }
+
+ if (!nal_size)
+ continue;
+
+ unit_type = *buf & 0x1f;
+
+ if (unit_type == H264_NAL_SPS) {
+ sps_seen = new_idr = 1;
+ } else if (unit_type == H264_NAL_PPS) {
+ pps_seen = new_idr = 1;
+ /* if SPS has not been seen yet, prepend the AVCC one to PPS */
+ if (!sps_seen) {
+ if (!s->sps_size) {
+ LOG_ONCE(ctx, AV_LOG_WARNING, "SPS not present in the stream, nor in AVCC, stream may be unreadable\n");
+ } else {
+ count_or_copy(&out, &out_size, s->sps, s->sps_size, -1, j);
+ sps_seen = 1;
+ }
}
}
- }
- /* if this is a new IDR picture following an IDR picture, reset the idr flag.
- * Just check first_mb_in_slice to be 0 as this is the simplest solution.
- * This could be checking idr_pic_id instead, but would complexify the parsing. */
- if (!s->new_idr && unit_type == H264_NAL_IDR_SLICE && (buf[1] & 0x80))
- s->new_idr = 1;
-
- /* prepend only to the first type 5 NAL unit of an IDR picture, if no sps/pps are already present */
- if (s->new_idr && unit_type == H264_NAL_IDR_SLICE && !s->idr_sps_seen && !s->idr_pps_seen) {
- if ((ret=alloc_and_copy(out,
- ctx->par_out->extradata, ctx->par_out->extradata_size,
- buf, nal_size, 1)) < 0)
- goto fail;
- s->new_idr = 0;
- /* if only SPS has been seen, also insert PPS */
- } else if (s->new_idr && unit_type == H264_NAL_IDR_SLICE && s->idr_sps_seen && !s->idr_pps_seen) {
- if (s->pps_offset == -1) {
- av_log(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
- if ((ret = alloc_and_copy(out, NULL, 0, buf, nal_size, 0)) < 0)
- goto fail;
- } else if ((ret = alloc_and_copy(out,
- ctx->par_out->extradata + s->pps_offset, ctx->par_out->extradata_size - s->pps_offset,
- buf, nal_size, 1)) < 0)
- goto fail;
- } else {
- if ((ret=alloc_and_copy(out, NULL, 0, buf, nal_size, unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS)) < 0)
+ /* If this is a new IDR picture following an IDR picture, reset the idr flag.
+ * Just check first_mb_in_slice to be 0 as this is the simplest solution.
+ * This could be checking idr_pic_id instead, but would complexify the parsing. */
+ if (!new_idr && unit_type == H264_NAL_IDR_SLICE && (buf[1] & 0x80))
+ new_idr = 1;
+
+ /* prepend only to the first type 5 NAL unit of an IDR picture, if no sps/pps are already present */
+ if (new_idr && unit_type == H264_NAL_IDR_SLICE && !sps_seen && !pps_seen) {
+ if (ctx->par_out->extradata)
+ count_or_copy(&out, &out_size, ctx->par_out->extradata,
+ ctx->par_out->extradata_size, -1, j);
+ new_idr = 0;
+ /* if only SPS has been seen, also insert PPS */
+ } else if (new_idr && unit_type == H264_NAL_IDR_SLICE && sps_seen && !pps_seen) {
+ if (!s->pps_size) {
+ LOG_ONCE(ctx, AV_LOG_WARNING, "PPS not present in the stream, nor in AVCC, stream may be unreadable\n");
+ } else {
+ count_or_copy(&out, &out_size, s->pps, s->pps_size, -1, j);
+ }
+ }
+
+ count_or_copy(&out, &out_size, buf, nal_size,
+ unit_type == H264_NAL_SPS || unit_type == H264_NAL_PPS, j);
+ if (!new_idr && unit_type == H264_NAL_SLICE) {
+ new_idr = 1;
+ sps_seen = 0;
+ pps_seen = 0;
+ }
+
+ buf += nal_size;
+ } while (buf < buf_end);
+
+ if (!j) {
+ if (out_size > INT_MAX - AV_INPUT_BUFFER_PADDING_SIZE) {
+ ret = AVERROR_INVALIDDATA;
goto fail;
- if (!s->new_idr && unit_type == H264_NAL_SLICE) {
- s->new_idr = 1;
- s->idr_sps_seen = 0;
- s->idr_pps_seen = 0;
}
+ ret = av_new_packet(opkt, out_size);
+ if (ret < 0)
+ goto fail;
+ out = opkt->data;
}
+ }
+#undef LOG_ONCE
+
+ av_assert1(out_size == opkt->size);
-next_nal:
- buf += nal_size;
- cumul_size += nal_size + s->length_size;
- } while (cumul_size < buf_size);
+ s->new_idr = new_idr;
+ s->idr_sps_seen = sps_seen;
+ s->idr_pps_seen = pps_seen;
- ret = av_packet_copy_props(out, in);
+ ret = av_packet_copy_props(opkt, in);
if (ret < 0)
goto fail;
fail:
if (ret < 0)
- av_packet_unref(out);
+ av_packet_unref(opkt);
av_packet_free(&in);
return ret;
projects / ffmpeg / blobdiff