summaryrefslogtreecommitdiff
path: root/tools/h264.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/h264.c')
-rw-r--r--tools/h264.c224
1 files changed, 0 insertions, 224 deletions
diff --git a/tools/h264.c b/tools/h264.c
deleted file mode 100644
index a729a289..00000000
--- a/tools/h264.c
+++ /dev/null
@@ -1,224 +0,0 @@
-/*
- * h264.c: H.264 bitstream decoding
- *
- * See the main source file 'xineliboutput.c' for copyright information and
- * how to reach the author.
- *
- * $Id: h264.c,v 1.7 2009-03-31 11:33:05 phintuka Exp $
- *
- */
-
-#include <stdint.h>
-#include <string.h>
-
-#ifndef LOG_MODULENAME
-# define LOG_MODULENAME "[h264 ] "
-# define SysLogLevel iSysLogLevel
-# include "../logdefs.h"
-#endif
-
-#define NOCACHE 1
-#include "bitstream.h"
-
-#include "mpeg.h"
-#include "h264.h"
-
-
-int h264_parse_sps(const uint8_t *buf, int len, h264_sps_data_t *sps)
-{
- br_state br = BR_INIT(buf, len);
- int profile_idc, pic_order_cnt_type;
- int frame_mbs_only;
- int i, j;
-
- profile_idc = br_get_u8(&br);
- LOGDBG("H.264 SPS: profile_idc %d", profile_idc);
- /* constraint_set0_flag = br_get_bit(br); */
- /* constraint_set1_flag = br_get_bit(br); */
- /* constraint_set2_flag = br_get_bit(br); */
- /* constraint_set3_flag = br_get_bit(br); */
- /* reserved = br_get_bits(br,4); */
- /* level_idc = br_get_u8(br); */
- br_skip_bits(&br, 16);
- br_skip_ue_golomb(&br); /* seq_parameter_set_id */
- if (profile_idc >= 100) {
- if (br_get_ue_golomb(&br) == 3) /* chroma_format_idc */
- br_skip_bit(&br); /* residual_colour_transform_flag */
- br_skip_ue_golomb(&br); /* bit_depth_luma - 8 */
- br_skip_ue_golomb(&br); /* bit_depth_chroma - 8 */
- br_skip_bit(&br); /* transform_bypass */
- if (br_get_bit(&br)) /* seq_scaling_matrix_present */
- for (i = 0; i < 8; i++)
- if (br_get_bit(&br)) { /* seq_scaling_list_present */
- int last = 8, next = 8, size = (i<6) ? 16 : 64;
- for (j = 0; j < size; j++) {
- if (next)
- next = (last + br_get_se_golomb(&br)) & 0xff;
- last = next ?: last;
- }
- }
- }
-
- br_skip_ue_golomb(&br); /* log2_max_frame_num - 4 */
- pic_order_cnt_type = br_get_ue_golomb(&br);
- if (pic_order_cnt_type == 0)
- br_skip_ue_golomb(&br); /* log2_max_poc_lsb - 4 */
- else if (pic_order_cnt_type == 1) {
- br_skip_bit(&br); /* delta_pic_order_always_zero */
- br_skip_se_golomb(&br); /* offset_for_non_ref_pic */
- br_skip_se_golomb(&br); /* offset_for_top_to_bottom_field */
- j = br_get_ue_golomb(&br); /* num_ref_frames_in_pic_order_cnt_cycle */
- for (i = 0; i < j; i++)
- br_skip_se_golomb(&br); /* offset_for_ref_frame[i] */
- }
- br_skip_ue_golomb(&br); /* ref_frames */
- br_skip_bit(&br); /* gaps_in_frame_num_allowed */
- sps->width /* mbs */ = br_get_ue_golomb(&br) + 1;
- sps->height /* mbs */ = br_get_ue_golomb(&br) + 1;
- frame_mbs_only = br_get_bit(&br);
- LOGDBG("H.264 SPS: pic_width: %u mbs", (unsigned) sps->width);
- LOGDBG("H.264 SPS: pic_height: %u mbs", (unsigned) sps->height);
- LOGDBG("H.264 SPS: frame only flag: %d", frame_mbs_only);
-
- sps->width *= 16;
- sps->height *= 16 * (2-frame_mbs_only);
-
- if (!frame_mbs_only)
- if (br_get_bit(&br)) /* mb_adaptive_frame_field_flag */
- LOGDBG("H.264 SPS: MBAFF");
- br_skip_bit(&br); /* direct_8x8_inference_flag */
- if (br_get_bit(&br)) { /* frame_cropping_flag */
- uint32_t crop_left = br_get_ue_golomb(&br);
- uint32_t crop_right = br_get_ue_golomb(&br);
- uint32_t crop_top = br_get_ue_golomb(&br);
- uint32_t crop_bottom = br_get_ue_golomb(&br);
- LOGDBG("H.264 SPS: cropping %d %d %d %d",
- crop_left, crop_top, crop_right, crop_bottom);
-
- sps->width -= 2*(crop_left + crop_right);
- if (frame_mbs_only)
- sps->height -= 2*(crop_top + crop_bottom);
- else
- sps->height -= 4*(crop_top + crop_bottom);
- }
-
- /* VUI parameters */
- sps->pixel_aspect.num = 0;
- if (br_get_bit(&br)) { /* vui_parameters_present flag */
- if (br_get_bit(&br)) { /* aspect_ratio_info_present */
- uint32_t aspect_ratio_idc = br_get_u8(&br);
- LOGDBG("H.264 SPS: aspect_ratio_idc %d", aspect_ratio_idc);
-
- if (aspect_ratio_idc == 255 /* Extended_SAR */) {
- sps->pixel_aspect.num = br_get_u16(&br); /* sar_width */
- sps->pixel_aspect.den = br_get_u16(&br); /* sar_height */
- LOGDBG("H.264 SPS: -> sar %dx%d", sps->pixel_aspect.num, sps->pixel_aspect.den);
- } else {
- static const mpeg_rational_t aspect_ratios[] =
- { /* page 213: */
- /* 0: unknown */
- {0, 1},
- /* 1...16: */
- { 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}
- };
-
- if (aspect_ratio_idc < sizeof(aspect_ratios)/sizeof(aspect_ratios[0])) {
- memcpy(&sps->pixel_aspect, &aspect_ratios[aspect_ratio_idc], sizeof(mpeg_rational_t));
- LOGDBG("H.264 SPS: -> aspect ratio %d / %d", sps->pixel_aspect.num, sps->pixel_aspect.den);
- } else {
- LOGMSG("H.264 SPS: aspect_ratio_idc out of range !");
- }
- }
- }
- }
-
- LOGDBG("H.264 SPS: -> video size %dx%d, aspect %d:%d",
- sps->width, sps->height, sps->pixel_aspect.num, sps->pixel_aspect.den);
-
- if(BR_EOF(&br)) {
- LOGDBG("H.264 SPS: not enough data ?");
- return 0;
- }
- return 1;
-}
-
-static int h264_nal_unescape(uint8_t *dst, const uint8_t *src, int len)
-{
- int s = 0, d = 0;
- while (s < len) {
- if (!src[s] && !src[s+1]) {
- /* hit 00 00 xx */
- dst[d] = dst[d+1] = 0;
- s += 2;
- d += 2;
- if (src[s] == 3) {
- s++; /* 00 00 03 xx --> 00 00 xx */
- /*LOGDBG("h264_nal_unescape: hit 00 00 03 %02x", src[s]);*/
- if (s >= len)
- return d;
- } /* else if (src[s] == 0 || src[s] == 1) {
- LOGDBG("h264_nal_unescape: invalid NAL sequence 00 00 %02x %02x", src[s], src[s+1]);
- return -1;
- }*/
- }
- dst[d++] = src[s++];
- }
- return d;
-}
-
-int h264_get_picture_type(const uint8_t *buf, int len)
-{
- int i;
- for (i = 0; i < len-5; i++) {
- if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1 && buf[i + 3] == NAL_AUD) {
- uint8_t type = (buf[i + 4] >> 5);
- switch (type) {
- case 0: case 3: case 5: return I_FRAME;
- case 1: case 4: case 6: return P_FRAME;
- case 2: case 7: return B_FRAME;
- default:;
- }
- }
- }
- return NO_PICTURE;
-}
-
-int h264_get_video_size(const uint8_t *buf, int len, video_size_t *size)
-{
- int i;
-
- /* H.264 detection, search for NAL AUD */
- if (!IS_NAL_AUD(buf))
- return 0;
-
- /* if I-frame, search for NAL SPS */
- if (h264_get_picture_type(buf, len) != I_FRAME)
- return 0;
-
- /* scan video packet for sequence parameter set */
- for (i = 5; i < len-4; i++)
- if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1 && (buf[i + 3] & 0x1f) == NAL_SPS) {
-
- uint8_t nal_data[len];
- int nal_len;
-
- LOGDBG("H.264: Found NAL SPS at offset %d/%d", i, len);
-
- if (0 < (nal_len = h264_nal_unescape(nal_data, buf+i+4, len-i-4))) {
-
- h264_sps_data_t sps = {0};
-
- if (h264_parse_sps(nal_data, nal_len, &sps)) {
- size->width = sps.width;
- size->height = sps.height;
- memcpy(&size->pixel_aspect, &sps.pixel_aspect, sizeof(mpeg_rational_t));
- return 1;
- }
- LOGMSG("h264_get_video_size: not enough data ?");
- }
- }
-
- return 0;
-}
-
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-20 21:49:37 +0000