diff options
Diffstat (limited to 'libmkv/nut-generate.c')
| -rw-r--r-- | libmkv/nut-generate.c | 165 |
1 files changed, 71 insertions, 94 deletions
diff --git a/libmkv/nut-generate.c b/libmkv/nut-generate.c index 25b7627..c52d8c1 100644 --- a/libmkv/nut-generate.c +++ b/libmkv/nut-generate.c @@ -225,9 +225,11 @@ void nut_append_packet(struct buf *buf, uint8_t *startcode, void *data, size_t l /* High-level (specific to the properties we want) ****************************/ enum app_res { + APP_RES_INVALID = -1, APP_RES_640_480 = 0, APP_RES_720_480 = 1, APP_RES_720_576 = 2, + APP_RES_NUM = 3, }; #define APP_RES_MIN APP_RES_640_480 #define APP_RES_MAX APP_RES_720_576 @@ -259,147 +261,124 @@ struct app_state { enum app_res res; }; -bool app_write_intro(int fd, uint64_t time_ns) { - struct buf out = {0}; +void app_append_intro(struct buf *out, uint64_t time_ns, enum app_res res) { struct buf pkt = {0}; unsigned int frame_code = 0; #define INC_FRAME_CODE() do { frame_code++; if (frame_code == 'N') frame_code++; } while(0) - append(&out, nut_file_id_string, sizeof(nut_file_id_string)); + append(out, nut_file_id_string, sizeof(nut_file_id_string)); #define BOGUS(n) n /* main_header ********************************************************/ pkt.len = 0; /* head *******************************************/ - nut_append_vu(&pkt, 4); /*! version */ - nut_append_vu(&pkt, 0); /*! minor_version */ - nut_append_vu(&pkt, 1); /*! stream_count */ - nut_append_vu(&pkt, /*! max_distance */ + nut_append_vu(&pkt, 4); /*! version */ + nut_append_vu(&pkt, 0); /*! minor_version */ + nut_append_vu(&pkt, 1); /*! stream_count */ + nut_append_vu(&pkt, /*! max_distance */ APP_FRAME_MAX_HEADER + - app_res_fb_size(APP_RES_MAX)); + app_res_fb_size(res)); /* time bases *************************************/ - nut_append_vu(&pkt, 1); /*! time_base_count */ + nut_append_vu(&pkt, 1); /*! time_base_count */ /* time_base[0] = 1ns */ - nut_append_vu(&pkt, 1); /*! numerator */ - nut_append_vu(&pkt, 1000000000ULL); /*! denominator */ + nut_append_vu(&pkt, 1); /*! numerator */ + nut_append_vu(&pkt, 1000000000ULL); /*! denominator */ /* frame codes ************************************/ /* "A muxer SHOULD mark [frame codes] 0x00 and 0xFF as invalid" */ /* frame_code=0 (invalid) */ - nut_append_vu(&pkt, NUT_FRAMEFLAG_INVALID); /*! flags */ - nut_append_vu(&pkt, 2); /*! field_count */ - nut_append_vu(&pkt, BOGUS(0)); /*! 0: fields.pts */ - nut_append_vu(&pkt, 1); /*! 1: fields.size_msb_nul */ + nut_append_vu(&pkt, NUT_FRAMEFLAG_INVALID); /*! flags */ + nut_append_vu(&pkt, 2); /*! field_count */ + nut_append_vu(&pkt, BOGUS(0)); /*! 0: fields.pts */ + nut_append_vu(&pkt, 1); /*! 1: fields.size_msb_nul */ INC_FRAME_CODE(); - for (enum app_res res = APP_RES_MIN; res <= APP_RES_MAX; res++) { - /* frame_code=(res*2)+1 (at `res`) */ - nut_append_vu(&pkt, APP_COMMON_FLAGS); /*! flags */ - nut_append_vu(&pkt, 6); /*! field_count */ - nut_append_vu(&pkt, BOGUS(0)); /*! 0: fields.pts */ - nut_append_vu(&pkt, APP_FRAME_SIZE_MSB_MUL); /*! 1: fields.size_msb_nul */ - nut_append_vu(&pkt, 0); /*! 2: fields.stream */ - nut_append_vu(&pkt, /*! 3: fields.size_lsb */ - app_res_fb_size(res) % APP_FRAME_SIZE_MSB_MUL); - nut_append_vu(&pkt, 0); /*! 4: fields.reserved */ - nut_append_vu(&pkt, 1); /*! 5: fields.count */ - INC_FRAME_CODE(); - - /* frame_code=(res*2)+2 (change to `res`) */ - nut_append_vu(&pkt, APP_COMMON_FLAGS| /*! flags */ - NUT_FRAMEFLAG_SM_DATA); - nut_append_vu(&pkt, 6); /*! field_count */ - nut_append_vu(&pkt, BOGUS(0)); /*! 0: fields.pts */ - nut_append_vu(&pkt, APP_FRAME_SIZE_MSB_MUL); /*! 1: fields.size_msb_nul */ - nut_append_vu(&pkt, 0); /*! 2: fields.stream */ - nut_append_vu(&pkt, /*! 3: fields.size_lsb */ - (app_res_sm_size(res) + app_res_fb_size(res)) % APP_FRAME_SIZE_MSB_MUL); - nut_append_vu(&pkt, 0); /*! 4: fields.reserved */ - nut_append_vu(&pkt, 1); /*! 5: fields.count */ - INC_FRAME_CODE(); - } + /* frame_code=1 (res) */ + nut_append_vu(&pkt, /*! flags */ + NUT_FRAMEFLAG_KEY | /* Because they're full framebuffers, all frames are keyframes. */ + NUT_FRAMEFLAG_SIZE_MSB | /* 640*480/2 > 16384 (the max val of data_size_lsb). */ + NUT_FRAMEFLAG_CODED_PTS | /* framerate is unknown, each frame must have a timestamp. */ + NUT_FRAMEFLAG_CHECKSUM ); /* framerate is unknown, guard against exceeding max_pts_distance. */ + nut_append_vu(&pkt, 6); /*! field_count */ + nut_append_vu(&pkt, BOGUS(0)); /*! 0: fields.pts */ + nut_append_vu(&pkt, APP_FRAME_SIZE_MSB_MUL); /*! 1: fields.size_msb_nul */ + nut_append_vu(&pkt, 0); /*! 2: fields.stream */ + nut_append_vu(&pkt, /*! 3: fields.size_lsb */ + app_res_fb_size(res) % APP_FRAME_SIZE_MSB_MUL); + nut_append_vu(&pkt, 0); /*! 4: fields.reserved */ + nut_append_vu(&pkt, 1); /*! 5: fields.count */ + INC_FRAME_CODE(); /* frame_code=N-255 (invalid) */ - nut_append_vu(&pkt, NUT_FRAMEFLAG_INVALID); /*! flags */ - nut_append_vu(&pkt, 2); /*! field_count */ - nut_append_vu(&pkt, BOGUS(0)); /*! 0: fields.pts */ - nut_append_vu(&pkt, /*! 1: fields.size_msb_nul */ + nut_append_vu(&pkt, NUT_FRAMEFLAG_INVALID); /*! flags */ + nut_append_vu(&pkt, 2); /*! field_count */ + nut_append_vu(&pkt, BOGUS(0)); /*! 0: fields.pts */ + nut_append_vu(&pkt, /*! 1: fields.size_msb_nul */ 256-frame_code-(frame_code < 'N' ? 1 : 0)); /* tail *******************************************/ - nut_append_vu(&pkt, 0); /*! header_count_minus_1 */ - nut_append_vu(&pkt, NUT_MAINFLAG_PIPE_MODE); /*! main_flags */ + nut_append_vu(&pkt, 0); /*! header_count_minus_1 */ + nut_append_vu(&pkt, NUT_MAINFLAG_PIPE_MODE); /*! main_flags */ - nut_append_packet(&out, nut_startcode_main, pkt.dat, pkt.len); + nut_append_packet(out, nut_startcode_main, pkt.dat, pkt.len); /* stream_header ******************************************************/ pkt.len = 0; - nut_append_vu(&pkt, 0); /*! stream_id */ - nut_append_vu(&pkt, NUT_STREAMCLASS_VIDEO); /*! stream_class */ - nut_append_vb(&pkt, "BGR\x08", 4); /*! fourcc */ - nut_append_vu(&pkt, 0); /*! time_base_id */ - nut_append_vu(&pkt, BOGUS(0)); /*! msb_pts_shift (only relevant if FRAMEFLAG_CODED_PTS) */ - nut_append_vu(&pkt, BOGUS(0)); /*! max_pts_distance (all frames have a checksum) */ - nut_append_vu(&pkt, 0); /*! decode_delay */ - nut_append_vu(&pkt, 0); /*! stream_flags */ - nut_append_vb(&pkt, NULL, 0); /*! codec_specific_data */ - state->res = APP_RES_640_480; - nut_append_vu(&pkt, app_res_w(state->res)); /*! width */ - nut_append_vu(&pkt, app_res_h(state->res)); /*! height */ - nut_append_vu(&pkt, 1); /*! sample_width */ - nut_append_vu(&pkt, 2); /*! sample_height */ - nut_append_vu(&pkt, NUT_COLORSPACE_UNKNOWN); /*! colorspace_type */ - - nut_append_packet(&out, nut_startcode_stream, pkt.dat, pkt.len); + nut_append_vu(&pkt, 0); /*! stream_id */ + nut_append_vu(&pkt, NUT_STREAMCLASS_VIDEO); /*! stream_class */ + nut_append_vb(&pkt, "BGR\x08", 4); /*! fourcc */ + nut_append_vu(&pkt, 0); /*! time_base_id */ + nut_append_vu(&pkt, 0); /*! msb_pts_shift */ + nut_append_vu(&pkt, BOGUS(0)); /*! max_pts_distance (all frames have a checksum) */ + nut_append_vu(&pkt, 0); /*! decode_delay */ + nut_append_vu(&pkt, 0); /*! stream_flags */ + nut_append_vb(&pkt, NULL, 0); /*! codec_specific_data */ + nut_append_vu(&pkt, app_res_w(res)); /*! width */ + nut_append_vu(&pkt, app_res_h(res)); /*! height */ + nut_append_vu(&pkt, 1); /*! sample_width */ + nut_append_vu(&pkt, 2); /*! sample_height */ + nut_append_vu(&pkt, NUT_COLORSPACE_UNKNOWN); /*! colorspace_type */ + + nut_append_packet(out, nut_startcode_stream, pkt.dat, pkt.len); /* syncpoint **********************************************************/ pkt.len = 0; - nut_append_vu(&pkt, time_ns); /*! global_key_pts */ - nut_append_vu(&pkt, 0); /*! back_ptr_div16 */ + nut_append_vu(&pkt, time_ns); /*! global_key_pts */ + nut_append_vu(&pkt, 0); /*! back_ptr_div16 */ - nut_append_packet(&out, nut_startcode_syncpoint, pkt.dat, pkt.len); + nut_append_packet(out, nut_startcode_syncpoint, pkt.dat, pkt.len); /* flush **************************************************************/ #undef BOGUS - bool ret = xwrite(fd, out.dat, out.len); - free(out.dat); free(pkt.dat); - return ret; } bool app_write_frame(int fd, struct app_state *state, uint64_t time_ns, enum app_res res, void *framebuffer) { assert(framebuffer); + assert(0 <= res && res < APP_RES_NUM); struct buf out = {0}; struct buf pkt = {0}; + if (res != state->res) { + app_append_intro(&out, time_ns, res); + state->res = res; + } + /* frame header ( 1+10+1+4 = 16 bytes) */ uint64_t frame_beg = out.len; - nut_append_u8(&out, 1+(2*res)+(res != state->res ? 1 : 0)); /*! frame_code (1 byte) */ + nut_append_u8(&out, 1); /*! frame_code (1 byte) */ nut_append_vu(&out, time_ns); /*! coded_pts (<=10 bytes) */ - nut_append_vu(&out, /*! data_size_msb (1 byte) */ - (app_res_fb_size(res) + (res != state->res ? app_res_sm_size(res) : 0)) / APP_FRAME_SIZE_MSB_MUL); + nut_append_vu(&out, app_res_fb_size(res) / APP_FRAME_SIZE_MSB_MUL); /*! data_size_msb (1 byte) */ nut_append_u32(&out, nut_crc32(&out.dat[frame_beg], out.len - frame_beg)); /*! checksum (4 bytes) */ - assert(out.len <= APP_FRAME_MAX_HEADER); - - /* side/meta data ( 1+(6+2)+(7+2)+1 = 19 bytes) */ - if (res != state->res) { - uint64_t data_beg = out.len; - nut_append_vu(&out, 2); /*! side_data_count (1 byte) */ - nut_append_vb_str(&out, "Width"); /*! side_data[0].name (1+5 bytes) */ - nut_append_vu(&out, app_res_w(res)); /*! side_data[0].value (2 bytes) */ - nut_append_vb_str(&out, "Height"); /*! side_data[1].name (1+6 bytes) */ - nut_append_vu(&out, app_res_h(res)); /*! side_data[1].value (2 bytes) */ - nut_append_vu(&out, 0); /*! meta_data_count (1 byte) */ - assert(out.len - data_beg == app_res_sm_size(res)); - } + assert(out.len - frame_beg <= APP_FRAME_MAX_HEADER); /* flush */ bool err = xwrite(fd, out.dat, out.len); @@ -474,22 +453,20 @@ static_assert(LM_ARRAY_LEN(font) == 10); static_assert(sizeof(font[0]) == 32); int main() { - if (app_write_intro(1, 0)) - return 1; - struct app_state state = { - .res = 0, + .res = APP_RES_INVALID, }; uint8_t framebuffer[app_res_fb_size(APP_RES_MAX)]; #define SCALE 10 for (int i = 0; i < 10; i++) { - memset(framebuffer, 0, sizeof(framebuffer)); + enum app_res res = (i/2)%APP_RES_NUM; + memset(framebuffer, 0b00011000, sizeof(framebuffer)); for (int y = 0; y < 4*SCALE; y++) for (int x = 0; x < 8*SCALE; x++) - framebuffer[(y*app_res_w(i%(APP_RES_MAX+1)))+x] = font[i][((y/SCALE)*8)+(x/SCALE)] == ' ' ? 0b11000000 : 0b00000011; - if (app_write_frame(1, &state, ((uint64_t)i)*1000000000ULL, i%(APP_RES_MAX+1), framebuffer)) + framebuffer[(y*app_res_w(res))+x] = font[i][((y/SCALE)*8)+(x/SCALE)] == ' ' ? 0b11000000 : 0b00000011; + if (app_write_frame(1, &state, ((uint64_t)i)*1000000000ULL, res, framebuffer)) return 1; } return 0; |