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codecs.c
资源名称：quicktime4linux-1.0.0.tar.gz　[点击查看]
上传用户：luping1608
上传日期：2007-01-06
资源大小：38k
文件大小：5k
源码类别：

多媒体

开发平台：

Unix_Linux

codecs.c：源码内容
  1. #include "quicktime.h"
  3. int quicktime_init_vcodecs(quicktime_video_map_t *vtrack)
  4. {
  5. char *compressor = vtrack->track->mdia.minf.stbl.stsd.table[0].format;
  6. if(quicktime_match_32(compressor, QUICKTIME_RAW))
  7. quicktime_init_codec_raw(vtrack);
  8. if(quicktime_match_32(compressor, QUICKTIME_JPEG))
  9. quicktime_init_codec_jpeg(vtrack);
  10. if(quicktime_match_32(compressor, QUICKTIME_YUV2))
  11. quicktime_init_codec_yuv2(vtrack);
  13. return 0;
  14. }
  16. int quicktime_init_acodecs(quicktime_audio_map_t *atrack)
  17. {
  18. char *compressor = atrack->track->mdia.minf.stbl.stsd.table[0].format;
  19. if(quicktime_match_32(compressor, QUICKTIME_IMA4))
  20. quicktime_init_codec_ima4(atrack);
  21. if(quicktime_match_32(compressor, QUICKTIME_ULAW))
  22. quicktime_init_codec_ulaw(atrack);
  24. return 0;
  25. }
  28. int quicktime_delete_vcodecs(quicktime_video_map_t *vtrack)
  29. {
  30. char *compressor = vtrack->track->mdia.minf.stbl.stsd.table[0].format;
  31. if(quicktime_match_32(compressor, QUICKTIME_RAW))
  32. quicktime_delete_codec_raw(vtrack);
  33. if(quicktime_match_32(compressor, QUICKTIME_JPEG))
  34. quicktime_delete_codec_jpeg(vtrack);
  35. if(quicktime_match_32(compressor, QUICKTIME_YUV2))
  36. quicktime_delete_codec_yuv2(vtrack);
  38. return 0;
  39. }
  41. int quicktime_delete_acodecs(quicktime_audio_map_t *atrack)
  42. {
  43. char *compressor = atrack->track->mdia.minf.stbl.stsd.table[0].format;
  44. if(quicktime_match_32(compressor, QUICKTIME_IMA4))
  45. quicktime_delete_codec_ima4(atrack);
  46. if(quicktime_match_32(compressor, QUICKTIME_ULAW))
  47. quicktime_delete_codec_ulaw(atrack);
  49. return 0;
  50. }
  52. int quicktime_supported_video(quicktime_t *file, int track)
  53. {
  54. char *compressor = quicktime_video_compressor(file, track);
  56. if(quicktime_match_32(compressor, QUICKTIME_RAW)) return 1;
  57. if(quicktime_match_32(compressor, QUICKTIME_JPEG)) return 1;
  58. if(quicktime_match_32(compressor, QUICKTIME_YUV2)) return 1;
  60. return 0;
  61. }
  63. int quicktime_supported_audio(quicktime_t *file, int track)
  64. {
  65. char *compressor = quicktime_audio_compressor(file, track);
  66. if(quicktime_match_32(compressor, QUICKTIME_IMA4)) return 1;
  67. if(quicktime_match_32(compressor, QUICKTIME_ULAW)) return 1;
  69. return 0;
  70. }
  72. int quicktime_decode_video(quicktime_t *file, unsigned char **row_pointers, int track)
  73. {
  74. char *compressor = quicktime_video_compressor(file, track);
  75. int result = 0;
  77. // test ram cache boundary
  78. if(file->vtracks[track].frames_cached &&
  79. file->vtracks[track].current_position >= file->vtracks[track].frames_cached) result = 1;
  81. if(!result)
  82. {
  83. if(quicktime_match_32(compressor, QUICKTIME_RAW))
  84. result = quicktime_decode_raw(file, row_pointers, track);
  85. else
  86. if(quicktime_match_32(compressor, QUICKTIME_JPEG))
  87. result = quicktime_decode_jpeg(file, row_pointers, track);
  88. else
  89. if(quicktime_match_32(compressor, QUICKTIME_YUV2))
  90. result = quicktime_decode_yuv2(file, row_pointers, track);
  91. else
  92. result = 1;
  93. }
  95. file->vtracks[track].current_position++;
  97. return result;
  98. }
  100. int quicktime_encode_video(quicktime_t *file, unsigned char **row_pointers, int track)
  101. {
  102. char *compressor = quicktime_video_compressor(file, track);
  103. int result = 0;
  105. if(quicktime_match_32(compressor, QUICKTIME_RAW))
  106. result = quicktime_encode_raw(file, row_pointers, track);
  107. else
  108. if(quicktime_match_32(compressor, QUICKTIME_JPEG))
  109. result = quicktime_encode_jpeg(file, row_pointers, track);
  110. else
  111. if(quicktime_match_32(compressor, QUICKTIME_YUV2))
  112. result = quicktime_encode_yuv2(file, row_pointers, track);
  113. else
  114. result = 1;
  116. file->vtracks[track].current_position++;
  118. return result;
  119. }
  121. int quicktime_decode_audio(quicktime_t *file, 
  122. QUICKTIME_INT16 *output_i, 
  123. float *output_f, 
  124. long samples, 
  125. int channel)
  126. {
  127. int quicktime_track, quicktime_channel;
  128. char *compressor;
  129. int result = 1;
  131. quicktime_channel_location(file, &quicktime_track, &quicktime_channel, channel);
  132. compressor = quicktime_audio_compressor(file, quicktime_track);
  134. if(quicktime_match_32(compressor, QUICKTIME_IMA4))
  135. result = quicktime_decode_ima4(file, output_i, output_f, samples, quicktime_track, quicktime_channel);
  136. else
  137. if(quicktime_match_32(compressor, QUICKTIME_ULAW))
  138. result = quicktime_decode_ulaw(file, output_i, output_f, samples, quicktime_track, quicktime_channel);
  139. else
  140. result = 1;
  142. file->atracks[quicktime_track].current_position += samples;
  144. return result;
  145. }
  147. // Since all channels are written at the same time:
  148. // Encode using the compressor for the first audio track.
  149. // Which means all the audio channels must be on the same track.
  151. int quicktime_encode_audio(quicktime_t *file, QUICKTIME_INT16 **input_i, float **input_f, long samples)
  152. {
  153. int result = 1;
  154. char *compressor = quicktime_audio_compressor(file, 0);
  156. if(quicktime_match_32(compressor, QUICKTIME_IMA4))
  157. result = quicktime_encode_ima4(file, input_i, input_f, 0, samples, 0);
  158. else
  159. if(quicktime_match_32(compressor, QUICKTIME_ULAW))
  160. result = quicktime_encode_ulaw(file, input_i, input_f, 0, samples, 0);
  161. else
  162. result = 1;
  164. file->atracks[0].current_position += samples;
  166. return result;
  167. }
  169. long quicktime_samples_to_bytes(quicktime_trak_t *track, long samples)
  170. {
  171. char *compressor = track->mdia.minf.stbl.stsd.table[0].format;
  172. int channels = track->mdia.minf.stbl.stsd.table[0].channels;
  174. if(quicktime_match_32(compressor, QUICKTIME_IMA4)) 
  175. return samples * channels;
  177. if(quicktime_match_32(compressor, QUICKTIME_ULAW)) 
  178. return samples * channels;
  180. // Default use the sample size specification
  181. return samples * channels * track->mdia.minf.stbl.stsd.table[0].sample_size / 8;
  182. }