#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 *ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
+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);
}
const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end){
- const uint8_t *out= ff_avc_find_startcode_internal(p, end);
+ const uint8_t *out = avc_find_startcode_internal(p, end);
if(p<out && out<end && !out[-1]) out--;
return out;
}
ff_avc_parse_nal_units(pb, buf_in, *size);
- av_freep(buf);
*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;
- uint8_t *buf = NULL, *end, *start = NULL;
- uint8_t *sps = NULL, *pps = NULL;
- uint32_t sps_size = 0, pps_size = 0;
- int ret, nb_sps = 0, nb_pps = 0;
+ 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;
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;
}
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_close_dyn_buf(sps_pb, &sps);
- pps_size = avio_close_dyn_buf(pps_pb, &pps);
+ 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;
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:
- if (!sps)
- avio_close_dyn_buf(sps_pb, &sps);
- if (!pps)
- avio_close_dyn_buf(pps_pb, &pps);
- av_free(sps);
- av_free(pps);
+ ffio_free_dyn_buf(&sps_pb);
+ ffio_free_dyn_buf(&pps_pb);
+ ffio_free_dyn_buf(&sps_ext_pb);
av_free(start);
return ret;
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;
+}
projects / ffmpeg / blobdiff