519 lines
16 KiB
C
519 lines
16 KiB
C
// ISO/IEC 14496-1:2010(E)
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// Annex I: Usage of ITU-T Recommendation H.264 | ISO/IEC 14496-10 AVC (p150)
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//
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// 1. Start Codes shall not be present in the stream. The field indicating the size of each following NAL unit
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// shall be added before NAL unit.The size of this field is defined in DecoderSpecificInfo.
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// 2. It is recommended encapsulating one NAL unit in one SL packet when it is delivered over lossy environment.
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#include "mpeg4-avc.h"
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#include <string.h>
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#include <assert.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <errno.h>
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#define H264_NAL_IDR 5 // Coded slice of an IDR picture
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#define H264_NAL_SPS 7 // Sequence parameter set
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#define H264_NAL_PPS 8 // Picture parameter set
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#define H264_NAL_AUD 9 // Access unit delimiter
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#define H2645_BITSTREAM_FORMAT_DETECT
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struct h264_annexbtomp4_handle_t
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{
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struct mpeg4_avc_t* avc;
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int errcode;
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int* update; // avc sps/pps update flags
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int* vcl;
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uint8_t* out;
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size_t bytes;
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size_t capacity;
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};
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static const uint8_t* h264_startcode(const uint8_t *data, size_t bytes)
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{
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size_t i;
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for (i = 2; i + 1 < bytes; i++)
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{
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if (0x01 == data[i] && 0x00 == data[i - 1] && 0x00 == data[i - 2])
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return data + i + 1;
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}
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return NULL;
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}
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/// @return >0-ok, <=0-error
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static inline int h264_avcc_length(const uint8_t* h264, size_t bytes, size_t avcc)
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{
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size_t i;
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uint32_t n;
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n = 0;
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assert(3 <= avcc && avcc <= 4);
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for (i = 0; i < avcc && i < bytes; i++)
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n = (n << 8) | h264[i];
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return avcc >= bytes ? -1 : (int)n;
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}
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/// @return 1-true, 0-false
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static int mpeg4_h264_avcc_bitstream_valid(const uint8_t* h264, size_t bytes, size_t avcc)
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{
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size_t n;
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while(avcc + 1 < bytes)
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{
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n = h264_avcc_length(h264, bytes, avcc);
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if (n < 0 || n + avcc > bytes)
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return 0; // invalid
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h264 += n + avcc;
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bytes -= n + avcc;
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}
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return 0 == bytes ? 1 : 0;
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}
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/// @return 0-annexb, >0-avcc, <0-error
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int mpeg4_h264_bitstream_format(const uint8_t* h264, size_t bytes)
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{
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uint32_t n;
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if (bytes < 4)
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return -1;
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n = ((uint32_t)h264[0]) << 16 | ((uint32_t)h264[1]) << 8 | ((uint32_t)h264[2]);
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if (0 == n && h264[3] <= 1)
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{
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return 0; // annexb
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}
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else if(1 == n)
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{
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// try avcc & annexb
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return mpeg4_h264_avcc_bitstream_valid(h264, bytes, 4) ? 4 : 0;
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}
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else
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{
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// try avcc 4/3 bytes
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return mpeg4_h264_avcc_bitstream_valid(h264, bytes, 4) ? 4 : (mpeg4_h264_avcc_bitstream_valid(h264, bytes, 3) ? 3 : -1);
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}
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}
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static int mpeg4_h264_avcc_nalu(const void* h264, size_t bytes, int avcc, void (*handler)(void* param, const uint8_t* nalu, size_t bytes), void* param)
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{
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uint32_t n;
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const uint8_t* p, * end;
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p = (const uint8_t*)h264;
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end = (const uint8_t*)h264 + bytes;
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for(n = h264_avcc_length(p, (int)(end - p), avcc); p + n + avcc <= end; n = h264_avcc_length(p, (int)(end - p), avcc))
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{
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assert(n > 0);
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if (n > 0)
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{
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handler(param, p + avcc, (int)n);
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}
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p += n + avcc;
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}
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return 0;
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}
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///@param[in] h264 H.264 byte stream format data(A set of NAL units)
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int mpeg4_h264_annexb_nalu(const void* h264, size_t bytes, void (*handler)(void* param, const uint8_t* nalu, size_t bytes), void* param)
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{
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ptrdiff_t n;
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const uint8_t* p, *next, *end;
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#if defined(H2645_BITSTREAM_FORMAT_DETECT)
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int avcc;
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avcc = mpeg4_h264_bitstream_format(h264, bytes);
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if (avcc > 0)
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return mpeg4_h264_avcc_nalu(h264, bytes, avcc, handler, param);
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#endif
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end = (const uint8_t*)h264 + bytes;
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p = h264_startcode((const uint8_t*)h264, bytes);
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while (p)
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{
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next = h264_startcode(p, (int)(end - p));
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if (next)
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{
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n = next - p - 3;
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}
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else
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{
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n = end - p;
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}
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while (n > 0 && 0 == p[n - 1]) n--; // filter tailing zero
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assert(n > 0);
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if (n > 0)
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{
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handler(param, p, (int)n);
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}
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p = next;
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}
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return 0;
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}
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uint8_t mpeg4_h264_read_ue(const uint8_t* data, size_t bytes, size_t* offset)
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{
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int bit, i;
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int leadingZeroBits = -1;
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for (bit = 0; !bit && *offset / 8 < bytes; ++leadingZeroBits)
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{
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bit = (data[*offset / 8] >> (7 - (*offset % 8))) & 0x01;
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++*offset;
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}
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bit = 0;
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assert(leadingZeroBits < 32);
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for (i = 0; i < leadingZeroBits && *offset / 8 < bytes; i++)
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{
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bit = (bit << 1) | ((data[*offset / 8] >> (7 - (*offset % 8))) & 0x01);
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++*offset;
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}
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return (uint8_t)((1 << leadingZeroBits) - 1 + bit);
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}
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static void mpeg4_avc_remove(struct mpeg4_avc_t* avc, uint8_t* ptr, size_t bytes, const uint8_t* end)
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{
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uint8_t i;
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assert(ptr >= avc->data && ptr + bytes <= end && end <= avc->data + sizeof(avc->data));
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memmove(ptr, ptr + bytes, end - ptr - bytes);
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for (i = 0; i < avc->nb_sps; i++)
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{
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if (avc->sps[i].data > ptr)
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avc->sps[i].data -= bytes;
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}
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for (i = 0; i < avc->nb_pps; i++)
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{
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if (avc->pps[i].data > ptr)
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avc->pps[i].data -= bytes;
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}
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}
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static int h264_sps_copy(struct mpeg4_avc_t* avc, const uint8_t* nalu, size_t bytes)
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{
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size_t i;
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size_t offset;
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uint8_t spsid;
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if (bytes < 4 + 1)
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{
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assert(0);
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return -1; // invalid length
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}
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offset = 4 * 8; // 1-NALU + 3-profile+flags+level
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spsid = mpeg4_h264_read_ue(nalu, bytes, &offset);
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for (i = 0; i < avc->nb_sps; i++)
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{
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offset = 4 * 8; // reset offset
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if (spsid == mpeg4_h264_read_ue(avc->sps[i].data, avc->sps[i].bytes, &offset))
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{
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if (bytes == avc->sps[i].bytes && 0 == memcmp(nalu, avc->sps[i].data, bytes))
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return 0; // do nothing
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if (bytes > avc->sps[i].bytes && avc->off + (bytes - avc->sps[i].bytes) > sizeof(avc->data))
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{
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assert(0);
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return -1; // too big
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}
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mpeg4_avc_remove(avc, avc->sps[i].data, avc->sps[i].bytes, avc->data + avc->off);
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avc->off -= avc->sps[i].bytes;
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avc->sps[i].data = avc->data + avc->off;
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avc->sps[i].bytes = (uint16_t)bytes;
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memcpy(avc->sps[i].data, nalu, bytes);
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avc->off += bytes;
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return 1; // set update flag
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}
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}
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// copy new
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assert(avc->nb_sps < sizeof(avc->sps) / sizeof(avc->sps[0]));
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if (avc->nb_sps >= sizeof(avc->sps) / sizeof(avc->sps[0])
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|| avc->off + bytes > sizeof(avc->data))
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{
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assert(0);
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return -1;
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}
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avc->sps[avc->nb_sps].data = avc->data + avc->off;
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avc->sps[avc->nb_sps].bytes = (uint16_t)bytes;
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memcpy(avc->sps[avc->nb_sps].data, nalu, bytes);
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avc->off += bytes;
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++avc->nb_sps;
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return 1; // set update flag
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}
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static int h264_pps_copy(struct mpeg4_avc_t* avc, const uint8_t* nalu, size_t bytes)
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{
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size_t i;
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size_t offset;
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uint8_t spsid;
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uint8_t ppsid;
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if (bytes < 1 + 1)
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{
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assert(0);
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return -1; // invalid length
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}
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offset = 1 * 8; // 1-NALU
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ppsid = mpeg4_h264_read_ue(nalu, bytes, &offset);
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spsid = mpeg4_h264_read_ue(nalu, bytes, &offset);
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for (i = 0; i < avc->nb_pps; i++)
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{
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offset = 1 * 8; // reset offset
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if (ppsid == mpeg4_h264_read_ue(avc->pps[i].data, avc->pps[i].bytes, &offset) && spsid == mpeg4_h264_read_ue(avc->pps[i].data, avc->pps[i].bytes, &offset))
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{
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if (bytes == avc->pps[i].bytes && 0 == memcmp(nalu, avc->pps[i].data, bytes))
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return 0; // do nothing
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if (bytes > avc->pps[i].bytes && avc->off + (bytes - avc->pps[i].bytes) > sizeof(avc->data))
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{
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assert(0);
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return -1; // too big
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}
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mpeg4_avc_remove(avc, avc->pps[i].data, avc->pps[i].bytes, avc->data + avc->off);
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avc->off -= avc->pps[i].bytes;
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avc->pps[i].data = avc->data + avc->off;
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avc->pps[i].bytes = (uint16_t)bytes;
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memcpy(avc->pps[i].data, nalu, bytes);
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avc->off += bytes;
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return 1; // set update flag
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}
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}
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// fix openh264 sps/pps id cycle (0/0, 1/1, 2/2, ..., 31/31, 0/32, 1/33, ...)
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if ((unsigned int)avc->nb_pps + 1 >= sizeof(avc->pps) / sizeof(avc->pps[0]) && avc->nb_sps > 16)
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{
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// replace the oldest pps
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mpeg4_avc_remove(avc, avc->pps[0].data, avc->pps[0].bytes, avc->data + avc->off);
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avc->off -= avc->pps[0].bytes;
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avc->pps[0].data = avc->data + avc->off;
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avc->pps[0].bytes = (uint16_t)bytes;
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memcpy(avc->pps[0].data, nalu, bytes);
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avc->off += bytes;
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return 1; // set update flag
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}
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// copy new
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assert((unsigned int)avc->nb_pps + 1 < sizeof(avc->pps) / sizeof(avc->pps[0]));
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if ((unsigned int)avc->nb_pps + 1 >= sizeof(avc->pps) / sizeof(avc->pps[0])
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|| avc->off + bytes > sizeof(avc->data))
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{
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assert(0);
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return -1;
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}
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avc->pps[avc->nb_pps].data = avc->data + avc->off;
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avc->pps[avc->nb_pps].bytes = (uint16_t)bytes;
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memcpy(avc->pps[avc->nb_pps].data, nalu, bytes);
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avc->off += bytes;
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++avc->nb_pps; // fixme: uint8_t overflow
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return 1; // set update flag
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}
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int mpeg4_avc_update(struct mpeg4_avc_t* avc, const uint8_t* nalu, size_t bytes)
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{
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int r;
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switch (nalu[0] & 0x1f)
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{
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case H264_NAL_SPS:
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r = h264_sps_copy(avc, nalu, bytes);
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if (1 == r || 1 == avc->nb_sps)
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{
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// update profile/level
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avc->profile = nalu[1];
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avc->compatibility = nalu[2];
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avc->level = nalu[3];
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}
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break;
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case H264_NAL_PPS:
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r = h264_pps_copy(avc, nalu, bytes);
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break;
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default:
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r = 0;
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}
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return r;
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}
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static void h264_handler(void* param, const uint8_t* nalu, size_t bytes)
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{
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int r;
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uint8_t nalutype;
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struct h264_annexbtomp4_handle_t* mp4;
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mp4 = (struct h264_annexbtomp4_handle_t*)param;
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if (bytes < 1)
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{
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assert(0);
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return;
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}
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nalutype = (nalu[0]) & 0x1f;
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#if defined(H2645_FILTER_AUD)
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if (H264_NAL_AUD == nalutype)
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return; // ignore AUD
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#endif
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r = mpeg4_avc_update(mp4->avc, nalu, bytes);
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if (1 == r && mp4->update)
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*mp4->update = 1;
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else if (r < 0)
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mp4->errcode = r;
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// IDR-1, B/P-2, other-0
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if (mp4->vcl && 1 <= nalutype && nalutype <= H264_NAL_IDR)
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*mp4->vcl = nalutype == H264_NAL_IDR ? 1 : 2;
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if (mp4->capacity >= mp4->bytes + bytes + 4)
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{
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mp4->out[mp4->bytes + 0] = (uint8_t)((bytes >> 24) & 0xFF);
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mp4->out[mp4->bytes + 1] = (uint8_t)((bytes >> 16) & 0xFF);
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mp4->out[mp4->bytes + 2] = (uint8_t)((bytes >> 8) & 0xFF);
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mp4->out[mp4->bytes + 3] = (uint8_t)((bytes >> 0) & 0xFF);
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memmove(mp4->out + mp4->bytes + 4, nalu, bytes);
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mp4->bytes += bytes + 4;
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}
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else
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{
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mp4->errcode = -E2BIG;
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}
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}
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int h264_annexbtomp4(struct mpeg4_avc_t* avc, const void* data, size_t bytes, void* out, size_t size, int* vcl, int* update)
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{
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struct h264_annexbtomp4_handle_t h;
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memset(&h, 0, sizeof(h));
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h.avc = avc;
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h.vcl = vcl;
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h.update = update;
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h.out = (uint8_t*)out;
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h.capacity = size;
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if (vcl) *vcl = 0;
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if (update) *update = 0;
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mpeg4_h264_annexb_nalu(data, bytes, h264_handler, &h);
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avc->nalu = 4;
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return 0 == h.errcode ? (int)h.bytes : 0;
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}
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/// h264_is_new_access_unit H.264 new access unit(frame)
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/// @return 1-new access, 0-not a new access
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int h264_is_new_access_unit(const uint8_t* nalu, size_t bytes)
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{
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enum { NAL_NIDR = 1, NAL_PARTITION_A = 2, NAL_IDR = 5, NAL_SEI = 6, NAL_SPS = 7, NAL_PPS = 8, NAL_AUD = 9, };
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uint8_t nal_type;
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if(bytes < 2)
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return 0;
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nal_type = nalu[0] & 0x1f;
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// 7.4.1.2.3 Order of NAL units and coded pictures and association to access units
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if(NAL_AUD == nal_type || NAL_SPS == nal_type || NAL_PPS == nal_type || NAL_SEI == nal_type || (14 <= nal_type && nal_type <= 18))
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return 1;
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// 7.4.1.2.4 Detection of the first VCL NAL unit of a primary coded picture
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if(NAL_NIDR == nal_type || NAL_PARTITION_A == nal_type || NAL_IDR == nal_type)
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{
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// Live555 H264or5VideoStreamParser::parse
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// The high-order bit of the byte after the "nal_unit_header" tells us whether it's
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// the start of a new 'access unit' (and thus the current NAL unit ends an 'access unit'):
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return (nalu[1] & 0x80) ? 1 : 0; // first_mb_in_slice
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}
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return 0;
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}
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#if defined(_DEBUG) || defined(DEBUG)
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static void mpeg4_h264_bitstream_format_test(void)
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{
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const uint8_t bs3[] = { 0x00,0x00,0x01,0x67,0x42,0xe0,0x1e,0xab,0xcd, };
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const uint8_t bs4[] = { 0x00,0x00,0x00,0x01,0x67,0x42,0xe0,0x1e,0xab,0xcd, };
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const uint8_t bs5[] = { 0x00,0x00,0x00,0x00,0x01,0x67,0x42,0xe0,0x1e,0xab,0xcd, };
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const uint8_t avcc3[] = { 0x00,0x00,0x06,0x67,0x42,0xe0,0x1e,0xab,0xcd, };
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const uint8_t avcc4[] = { 0x00,0x00,0x00,0x06,0x67,0x42,0xe0,0x1e,0xab,0xcd, };
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assert(0 == mpeg4_h264_bitstream_format(bs3, sizeof(bs3)));
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assert(0 == mpeg4_h264_bitstream_format(bs4, sizeof(bs4)));
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assert(0 == mpeg4_h264_bitstream_format(bs5, sizeof(bs5)));
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assert(3 == mpeg4_h264_bitstream_format(avcc3, sizeof(avcc3)));
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assert(4 == mpeg4_h264_bitstream_format(avcc4, sizeof(avcc4)));
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}
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static void mpeg4_annexbtomp4_test2(void)
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{
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const uint8_t sps[] = { 0x00,0x00,0x00,0x01,0x67,0x42,0xe0,0x1e,0xab,0xcd, };
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const uint8_t pps[] = { 0x00,0x00,0x00,0x01,0x28,0xce,0x3c,0x80 };
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const uint8_t sps1[] = { 0x00,0x00,0x00,0x01,0x67,0x42,0xe0,0x1e,0x4b,0xcd, 0x01 };
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const uint8_t pps1[] = { 0x00,0x00,0x00,0x01,0x28,0xce,0x3c,0x80, 0x01 };
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const uint8_t sps2[] = { 0x00,0x00,0x00,0x01,0x67,0x42,0xe0,0x1e,0xab };
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const uint8_t pps2[] = { 0x00,0x00,0x00,0x01,0x28,0xce,0x3c };
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int vcl, update;
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uint8_t buffer[128];
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struct mpeg4_avc_t avc;
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memset(&avc, 0, sizeof(avc));
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h264_annexbtomp4(&avc, sps, sizeof(sps), buffer, sizeof(buffer), &vcl, &update);
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assert(0 == vcl && 1 == update);
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h264_annexbtomp4(&avc, pps, sizeof(pps), buffer, sizeof(buffer), &vcl, &update);
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assert(0 == vcl && 1 == update && 1 == avc.nb_sps && avc.sps[0].bytes == sizeof(sps)-4 && 0 == memcmp(avc.sps[0].data, sps+4, sizeof(sps) - 4) && 1 == avc.nb_pps && avc.pps[0].bytes == sizeof(pps) - 4 && 0 == memcmp(avc.pps[0].data, pps+4, sizeof(pps) - 4));
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h264_annexbtomp4(&avc, sps1, sizeof(sps1), buffer, sizeof(buffer), &vcl, &update);
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assert(0 == vcl && 1 == update && 2 == avc.nb_sps && avc.sps[0].bytes == sizeof(sps) - 4 && avc.sps[1].bytes == sizeof(sps1) - 4 && 0 == memcmp(avc.sps[0].data, sps+4, sizeof(sps) - 4) && 0 == memcmp(avc.sps[1].data, sps1 + 4, sizeof(sps1) - 4) && 1 == avc.nb_pps && avc.pps[0].bytes == sizeof(pps) - 4 && 0 == memcmp(avc.pps[0].data, pps + 4, sizeof(pps) - 4));
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h264_annexbtomp4(&avc, pps1, sizeof(pps1), buffer, sizeof(buffer), &vcl, &update);
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assert(0 == vcl && 1 == update && 2 == avc.nb_sps && avc.sps[0].bytes == sizeof(sps) - 4 && avc.sps[1].bytes == sizeof(sps1) - 4 && 0 == memcmp(avc.sps[0].data, sps + 4, sizeof(sps) - 4) && 0 == memcmp(avc.sps[1].data, sps1 + 4, sizeof(sps1) - 4) && 1 == avc.nb_pps && avc.pps[0].bytes == sizeof(pps1) - 4 && 0 == memcmp(avc.pps[0].data, pps1 + 4, sizeof(pps1) - 4));
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h264_annexbtomp4(&avc, sps2, sizeof(sps2), buffer, sizeof(buffer), &vcl, &update);
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assert(0 == vcl && 1 == update && 2 == avc.nb_sps && avc.sps[0].bytes == sizeof(sps2) - 4 && avc.sps[1].bytes == sizeof(sps1) - 4 && 0 == memcmp(avc.sps[0].data, sps2 + 4, sizeof(sps2) - 4) && 0 == memcmp(avc.sps[1].data, sps1 + 4, sizeof(sps1) - 4) && 1 == avc.nb_pps && avc.pps[0].bytes == sizeof(pps1) - 4 && 0 == memcmp(avc.pps[0].data, pps1 + 4, sizeof(pps1) - 4));
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h264_annexbtomp4(&avc, pps2, sizeof(pps2), buffer, sizeof(buffer), &vcl, &update);
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assert(0 == vcl && 1 == update && 2 == avc.nb_sps && avc.sps[0].bytes == sizeof(sps2) - 4 && avc.sps[1].bytes == sizeof(sps1) - 4 && 0 == memcmp(avc.sps[0].data, sps2 + 4, sizeof(sps2) - 4) && 0 == memcmp(avc.sps[1].data, sps1 + 4, sizeof(sps1) - 4) && 1 == avc.nb_pps && avc.pps[0].bytes == sizeof(pps2) - 4 && 0 == memcmp(avc.pps[0].data, pps2 + 4, sizeof(pps2) - 4));
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}
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void mpeg4_annexbtomp4_test(void)
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{
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const uint8_t sps[] = { 0x67,0x42,0xe0,0x1e,0xab };
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const uint8_t pps[] = { 0x28,0xce,0x3c,0x80 };
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const uint8_t annexb[] = { 0x00,0x00,0x00,0x01,0x67,0x42,0xe0,0x1e,0xab, 0x00,0x00,0x00,0x01,0x28,0xce,0x3c,0x80,0x00,0x00,0x00,0x01,0x65,0x11 };
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uint8_t output[256];
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int vcl, update;
|
|
|
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struct mpeg4_avc_t avc;
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memset(&avc, 0, sizeof(avc));
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assert(h264_annexbtomp4(&avc, annexb, sizeof(annexb), output, sizeof(output), &vcl, &update) > 0);
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assert(1 == avc.nb_sps && avc.sps[0].bytes == sizeof(sps) && 0 == memcmp(avc.sps[0].data, sps, sizeof(sps)));
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assert(1 == avc.nb_pps && avc.pps[0].bytes == sizeof(pps) && 0 == memcmp(avc.pps[0].data, pps, sizeof(pps)));
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assert(vcl == 1);
|
|
|
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mpeg4_annexbtomp4_test2();
|
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mpeg4_h264_bitstream_format_test();
|
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}
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#endif
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