mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 18:02:11 +00:00
a0b6df0a39
Up until now, ff_avc_decode_sps would parse a SPS and return some properties from it in a freshly allocated structure. Yet said structure is very small and completely internal to libavformat, so there is no reason to use the heap for it. This commit therefore changes the function to return an int and to modify a caller-provided structure. This will also allow ff_avc_decode_sps to return better error codes in the future. It also fixes a memleak in mxfenc: If a packet contained multiple SPS, only the SPS structure belonging to the last SPS would be freed, the other ones would leak when the pointer is overwritten to point to the new SPS structure. Of course, without allocations there are no leaks. This is Coverity issue #1445194. Furthermore, the SPS structure has been renamed from H264SequenceParameterSet to H264SPS in order to avoid overlong lines. Reviewed-by: Tomas Härdin <tjoppen@acc.umu.se> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
452 lines
14 KiB
C
452 lines
14 KiB
C
/*
|
|
* AVC helper functions for muxers
|
|
* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
|
|
*
|
|
* 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 "libavutil/intreadwrite.h"
|
|
#include "libavcodec/h264.h"
|
|
#include "libavcodec/get_bits.h"
|
|
#include "avformat.h"
|
|
#include "avio.h"
|
|
#include "avc.h"
|
|
#include "avio_internal.h"
|
|
|
|
static const uint8_t *avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
|
|
{
|
|
const uint8_t *a = p + 4 - ((intptr_t)p & 3);
|
|
|
|
for (end -= 3; p < a && p < end; p++) {
|
|
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
|
|
return p;
|
|
}
|
|
|
|
for (end -= 3; p < end; p += 4) {
|
|
uint32_t x = *(const uint32_t*)p;
|
|
// if ((x - 0x01000100) & (~x) & 0x80008000) // little endian
|
|
// if ((x - 0x00010001) & (~x) & 0x00800080) // big endian
|
|
if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
|
|
if (p[1] == 0) {
|
|
if (p[0] == 0 && p[2] == 1)
|
|
return p;
|
|
if (p[2] == 0 && p[3] == 1)
|
|
return p+1;
|
|
}
|
|
if (p[3] == 0) {
|
|
if (p[2] == 0 && p[4] == 1)
|
|
return p+2;
|
|
if (p[4] == 0 && p[5] == 1)
|
|
return p+3;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (end += 3; p < end; p++) {
|
|
if (p[0] == 0 && p[1] == 0 && p[2] == 1)
|
|
return p;
|
|
}
|
|
|
|
return end + 3;
|
|
}
|
|
|
|
const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){
|
|
const uint8_t *out = avc_find_startcode_internal(p, end);
|
|
if(p<out && out<end && !out[-1]) out--;
|
|
return out;
|
|
}
|
|
|
|
int ff_avc_parse_nal_units(AVIOContext *pb, const uint8_t *buf_in, int size)
|
|
{
|
|
const uint8_t *p = buf_in;
|
|
const uint8_t *end = p + size;
|
|
const uint8_t *nal_start, *nal_end;
|
|
|
|
size = 0;
|
|
nal_start = ff_avc_find_startcode(p, end);
|
|
for (;;) {
|
|
while (nal_start < end && !*(nal_start++));
|
|
if (nal_start == end)
|
|
break;
|
|
|
|
nal_end = ff_avc_find_startcode(nal_start, end);
|
|
avio_wb32(pb, nal_end - nal_start);
|
|
avio_write(pb, nal_start, nal_end - nal_start);
|
|
size += 4 + nal_end - nal_start;
|
|
nal_start = nal_end;
|
|
}
|
|
return size;
|
|
}
|
|
|
|
int ff_avc_parse_nal_units_buf(const uint8_t *buf_in, uint8_t **buf, int *size)
|
|
{
|
|
AVIOContext *pb;
|
|
int ret = avio_open_dyn_buf(&pb);
|
|
if(ret < 0)
|
|
return ret;
|
|
|
|
ff_avc_parse_nal_units(pb, buf_in, *size);
|
|
|
|
*size = avio_close_dyn_buf(pb, buf);
|
|
return 0;
|
|
}
|
|
|
|
int ff_isom_write_avcc(AVIOContext *pb, const uint8_t *data, int len)
|
|
{
|
|
AVIOContext *sps_pb = NULL, *pps_pb = NULL, *sps_ext_pb = NULL;
|
|
uint8_t *buf, *end, *start;
|
|
uint8_t *sps, *pps, *sps_ext;
|
|
uint32_t sps_size = 0, pps_size = 0, sps_ext_size = 0;
|
|
int ret, nb_sps = 0, nb_pps = 0, nb_sps_ext = 0;
|
|
|
|
if (len <= 6)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
/* check for H.264 start code */
|
|
if (AV_RB32(data) != 0x00000001 &&
|
|
AV_RB24(data) != 0x000001) {
|
|
avio_write(pb, data, len);
|
|
return 0;
|
|
}
|
|
|
|
ret = ff_avc_parse_nal_units_buf(data, &buf, &len);
|
|
if (ret < 0)
|
|
return ret;
|
|
start = buf;
|
|
end = buf + len;
|
|
|
|
ret = avio_open_dyn_buf(&sps_pb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
ret = avio_open_dyn_buf(&pps_pb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
ret = avio_open_dyn_buf(&sps_ext_pb);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
/* look for sps and pps */
|
|
while (end - buf > 4) {
|
|
uint32_t size;
|
|
uint8_t nal_type;
|
|
size = FFMIN(AV_RB32(buf), end - buf - 4);
|
|
buf += 4;
|
|
nal_type = buf[0] & 0x1f;
|
|
|
|
if (nal_type == 7) { /* SPS */
|
|
nb_sps++;
|
|
if (size > UINT16_MAX || nb_sps >= H264_MAX_SPS_COUNT) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
avio_wb16(sps_pb, size);
|
|
avio_write(sps_pb, buf, size);
|
|
} else if (nal_type == 8) { /* PPS */
|
|
nb_pps++;
|
|
if (size > UINT16_MAX || nb_pps >= H264_MAX_PPS_COUNT) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
avio_wb16(pps_pb, size);
|
|
avio_write(pps_pb, buf, size);
|
|
} else if (nal_type == 13) { /* SPS_EXT */
|
|
nb_sps_ext++;
|
|
if (size > UINT16_MAX || nb_sps_ext >= 256) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
avio_wb16(sps_ext_pb, size);
|
|
avio_write(sps_ext_pb, buf, size);
|
|
}
|
|
|
|
buf += size;
|
|
}
|
|
sps_size = avio_get_dyn_buf(sps_pb, &sps);
|
|
pps_size = avio_get_dyn_buf(pps_pb, &pps);
|
|
sps_ext_size = avio_get_dyn_buf(sps_ext_pb, &sps_ext);
|
|
|
|
if (sps_size < 6 || !pps_size) {
|
|
ret = AVERROR_INVALIDDATA;
|
|
goto fail;
|
|
}
|
|
|
|
avio_w8(pb, 1); /* version */
|
|
avio_w8(pb, sps[3]); /* profile */
|
|
avio_w8(pb, sps[4]); /* profile compat */
|
|
avio_w8(pb, sps[5]); /* level */
|
|
avio_w8(pb, 0xff); /* 6 bits reserved (111111) + 2 bits nal size length - 1 (11) */
|
|
avio_w8(pb, 0xe0 | nb_sps); /* 3 bits reserved (111) + 5 bits number of sps */
|
|
|
|
avio_write(pb, sps, sps_size);
|
|
avio_w8(pb, nb_pps); /* number of pps */
|
|
avio_write(pb, pps, pps_size);
|
|
|
|
if (sps[3] != 66 && sps[3] != 77 && sps[3] != 88) {
|
|
H264SPS seq;
|
|
ret = ff_avc_decode_sps(&seq, sps + 3, sps_size - 3);
|
|
if (ret < 0)
|
|
goto fail;
|
|
|
|
avio_w8(pb, 0xfc | seq.chroma_format_idc); /* 6 bits reserved (111111) + chroma_format_idc */
|
|
avio_w8(pb, 0xf8 | (seq.bit_depth_luma - 8)); /* 5 bits reserved (11111) + bit_depth_luma_minus8 */
|
|
avio_w8(pb, 0xf8 | (seq.bit_depth_chroma - 8)); /* 5 bits reserved (11111) + bit_depth_chroma_minus8 */
|
|
avio_w8(pb, nb_sps_ext); /* number of sps ext */
|
|
if (nb_sps_ext)
|
|
avio_write(pb, sps_ext, sps_ext_size);
|
|
}
|
|
|
|
fail:
|
|
ffio_free_dyn_buf(&sps_pb);
|
|
ffio_free_dyn_buf(&pps_pb);
|
|
ffio_free_dyn_buf(&sps_ext_pb);
|
|
av_free(start);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int ff_avc_write_annexb_extradata(const uint8_t *in, uint8_t **buf, int *size)
|
|
{
|
|
uint16_t sps_size, pps_size;
|
|
uint8_t *out;
|
|
int out_size;
|
|
|
|
*buf = NULL;
|
|
if (*size >= 4 && (AV_RB32(in) == 0x00000001 || AV_RB24(in) == 0x000001))
|
|
return 0;
|
|
if (*size < 11 || in[0] != 1)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
sps_size = AV_RB16(&in[6]);
|
|
if (11 + sps_size > *size)
|
|
return AVERROR_INVALIDDATA;
|
|
pps_size = AV_RB16(&in[9 + sps_size]);
|
|
if (11 + sps_size + pps_size > *size)
|
|
return AVERROR_INVALIDDATA;
|
|
out_size = 8 + sps_size + pps_size;
|
|
out = av_mallocz(out_size + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!out)
|
|
return AVERROR(ENOMEM);
|
|
AV_WB32(&out[0], 0x00000001);
|
|
memcpy(out + 4, &in[8], sps_size);
|
|
AV_WB32(&out[4 + sps_size], 0x00000001);
|
|
memcpy(out + 8 + sps_size, &in[11 + sps_size], pps_size);
|
|
*buf = out;
|
|
*size = out_size;
|
|
return 0;
|
|
}
|
|
|
|
const uint8_t *ff_avc_mp4_find_startcode(const uint8_t *start,
|
|
const uint8_t *end,
|
|
int nal_length_size)
|
|
{
|
|
unsigned int res = 0;
|
|
|
|
if (end - start < nal_length_size)
|
|
return NULL;
|
|
while (nal_length_size--)
|
|
res = (res << 8) | *start++;
|
|
|
|
if (res > end - start)
|
|
return NULL;
|
|
|
|
return start + res;
|
|
}
|
|
|
|
uint8_t *ff_nal_unit_extract_rbsp(const uint8_t *src, uint32_t src_len,
|
|
uint32_t *dst_len, int header_len)
|
|
{
|
|
uint8_t *dst;
|
|
uint32_t i, len;
|
|
|
|
dst = av_malloc(src_len + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!dst)
|
|
return NULL;
|
|
|
|
/* NAL unit header */
|
|
i = len = 0;
|
|
while (i < header_len && i < src_len)
|
|
dst[len++] = src[i++];
|
|
|
|
while (i + 2 < src_len)
|
|
if (!src[i] && !src[i + 1] && src[i + 2] == 3) {
|
|
dst[len++] = src[i++];
|
|
dst[len++] = src[i++];
|
|
i++; // remove emulation_prevention_three_byte
|
|
} else
|
|
dst[len++] = src[i++];
|
|
|
|
while (i < src_len)
|
|
dst[len++] = src[i++];
|
|
|
|
memset(dst + len, 0, AV_INPUT_BUFFER_PADDING_SIZE);
|
|
|
|
*dst_len = len;
|
|
return dst;
|
|
}
|
|
|
|
static const AVRational avc_sample_aspect_ratio[17] = {
|
|
{ 0, 1 },
|
|
{ 1, 1 },
|
|
{ 12, 11 },
|
|
{ 10, 11 },
|
|
{ 16, 11 },
|
|
{ 40, 33 },
|
|
{ 24, 11 },
|
|
{ 20, 11 },
|
|
{ 32, 11 },
|
|
{ 80, 33 },
|
|
{ 18, 11 },
|
|
{ 15, 11 },
|
|
{ 64, 33 },
|
|
{ 160, 99 },
|
|
{ 4, 3 },
|
|
{ 3, 2 },
|
|
{ 2, 1 },
|
|
};
|
|
|
|
static inline int get_ue_golomb(GetBitContext *gb) {
|
|
int i;
|
|
for (i = 0; i < 32 && !get_bits1(gb); i++)
|
|
;
|
|
return get_bitsz(gb, i) + (1 << i) - 1;
|
|
}
|
|
|
|
static inline int get_se_golomb(GetBitContext *gb) {
|
|
int v = get_ue_golomb(gb) + 1;
|
|
int sign = -(v & 1);
|
|
return ((v >> 1) ^ sign) - sign;
|
|
}
|
|
|
|
int ff_avc_decode_sps(H264SPS *sps, const uint8_t *buf, int buf_size)
|
|
{
|
|
int i, j, ret, rbsp_size, aspect_ratio_idc, pic_order_cnt_type;
|
|
int num_ref_frames_in_pic_order_cnt_cycle;
|
|
int delta_scale, lastScale = 8, nextScale = 8;
|
|
int sizeOfScalingList;
|
|
GetBitContext gb;
|
|
uint8_t *rbsp_buf;
|
|
|
|
rbsp_buf = ff_nal_unit_extract_rbsp(buf, buf_size, &rbsp_size, 0);
|
|
if (!rbsp_buf)
|
|
return AVERROR(ENOMEM);
|
|
|
|
ret = init_get_bits8(&gb, rbsp_buf, rbsp_size);
|
|
if (ret < 0)
|
|
goto end;
|
|
|
|
memset(sps, 0, sizeof(*sps));
|
|
|
|
sps->profile_idc = get_bits(&gb, 8);
|
|
sps->constraint_set_flags |= get_bits1(&gb) << 0; // constraint_set0_flag
|
|
sps->constraint_set_flags |= get_bits1(&gb) << 1; // constraint_set1_flag
|
|
sps->constraint_set_flags |= get_bits1(&gb) << 2; // constraint_set2_flag
|
|
sps->constraint_set_flags |= get_bits1(&gb) << 3; // constraint_set3_flag
|
|
sps->constraint_set_flags |= get_bits1(&gb) << 4; // constraint_set4_flag
|
|
sps->constraint_set_flags |= get_bits1(&gb) << 5; // constraint_set5_flag
|
|
skip_bits(&gb, 2); // reserved_zero_2bits
|
|
sps->level_idc = get_bits(&gb, 8);
|
|
sps->id = get_ue_golomb(&gb);
|
|
|
|
if (sps->profile_idc == 100 || sps->profile_idc == 110 ||
|
|
sps->profile_idc == 122 || sps->profile_idc == 244 || sps->profile_idc == 44 ||
|
|
sps->profile_idc == 83 || sps->profile_idc == 86 || sps->profile_idc == 118 ||
|
|
sps->profile_idc == 128 || sps->profile_idc == 138 || sps->profile_idc == 139 ||
|
|
sps->profile_idc == 134) {
|
|
sps->chroma_format_idc = get_ue_golomb(&gb); // chroma_format_idc
|
|
if (sps->chroma_format_idc == 3) {
|
|
skip_bits1(&gb); // separate_colour_plane_flag
|
|
}
|
|
sps->bit_depth_luma = get_ue_golomb(&gb) + 8;
|
|
sps->bit_depth_chroma = get_ue_golomb(&gb) + 8;
|
|
skip_bits1(&gb); // qpprime_y_zero_transform_bypass_flag
|
|
if (get_bits1(&gb)) { // seq_scaling_matrix_present_flag
|
|
for (i = 0; i < ((sps->chroma_format_idc != 3) ? 8 : 12); i++) {
|
|
if (!get_bits1(&gb)) // seq_scaling_list_present_flag
|
|
continue;
|
|
lastScale = 8;
|
|
nextScale = 8;
|
|
sizeOfScalingList = i < 6 ? 16 : 64;
|
|
for (j = 0; j < sizeOfScalingList; j++) {
|
|
if (nextScale != 0) {
|
|
delta_scale = get_se_golomb(&gb);
|
|
nextScale = (lastScale + delta_scale) & 0xff;
|
|
}
|
|
lastScale = nextScale == 0 ? lastScale : nextScale;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
sps->chroma_format_idc = 1;
|
|
sps->bit_depth_luma = 8;
|
|
sps->bit_depth_chroma = 8;
|
|
}
|
|
|
|
get_ue_golomb(&gb); // log2_max_frame_num_minus4
|
|
pic_order_cnt_type = get_ue_golomb(&gb);
|
|
|
|
if (pic_order_cnt_type == 0) {
|
|
get_ue_golomb(&gb); // log2_max_pic_order_cnt_lsb_minus4
|
|
} else if (pic_order_cnt_type == 1) {
|
|
skip_bits1(&gb); // delta_pic_order_always_zero
|
|
get_se_golomb(&gb); // offset_for_non_ref_pic
|
|
get_se_golomb(&gb); // offset_for_top_to_bottom_field
|
|
num_ref_frames_in_pic_order_cnt_cycle = get_ue_golomb(&gb);
|
|
for (i = 0; i < num_ref_frames_in_pic_order_cnt_cycle; i++)
|
|
get_se_golomb(&gb); // offset_for_ref_frame
|
|
}
|
|
|
|
get_ue_golomb(&gb); // max_num_ref_frames
|
|
skip_bits1(&gb); // gaps_in_frame_num_value_allowed_flag
|
|
get_ue_golomb(&gb); // pic_width_in_mbs_minus1
|
|
get_ue_golomb(&gb); // pic_height_in_map_units_minus1
|
|
|
|
sps->frame_mbs_only_flag = get_bits1(&gb);
|
|
if (!sps->frame_mbs_only_flag)
|
|
skip_bits1(&gb); // mb_adaptive_frame_field_flag
|
|
|
|
skip_bits1(&gb); // direct_8x8_inference_flag
|
|
|
|
if (get_bits1(&gb)) { // frame_cropping_flag
|
|
get_ue_golomb(&gb); // frame_crop_left_offset
|
|
get_ue_golomb(&gb); // frame_crop_right_offset
|
|
get_ue_golomb(&gb); // frame_crop_top_offset
|
|
get_ue_golomb(&gb); // frame_crop_bottom_offset
|
|
}
|
|
|
|
if (get_bits1(&gb)) { // vui_parameters_present_flag
|
|
if (get_bits1(&gb)) { // aspect_ratio_info_present_flag
|
|
aspect_ratio_idc = get_bits(&gb, 8);
|
|
if (aspect_ratio_idc == 0xff) {
|
|
sps->sar.num = get_bits(&gb, 16);
|
|
sps->sar.den = get_bits(&gb, 16);
|
|
} else if (aspect_ratio_idc < FF_ARRAY_ELEMS(avc_sample_aspect_ratio)) {
|
|
sps->sar = avc_sample_aspect_ratio[aspect_ratio_idc];
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!sps->sar.den) {
|
|
sps->sar.num = 1;
|
|
sps->sar.den = 1;
|
|
}
|
|
|
|
ret = 0;
|
|
end:
|
|
av_free(rbsp_buf);
|
|
return ret;
|
|
}
|