00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022 #include "libavutil/intreadwrite.h"
00023 #include "libavutil/imgutils.h"
00024 #include "avcodec.h"
00025
00026 typedef struct DPXContext {
00027 AVFrame picture;
00028 int big_endian;
00029 int bits_per_component;
00030 int descriptor;
00031 } DPXContext;
00032
00033 static av_cold int encode_init(AVCodecContext *avctx)
00034 {
00035 DPXContext *s = avctx->priv_data;
00036
00037 avctx->coded_frame = &s->picture;
00038 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
00039 avctx->coded_frame->key_frame = 1;
00040
00041 s->big_endian = 1;
00042 s->bits_per_component = 8;
00043 s->descriptor = 50;
00044
00045 switch (avctx->pix_fmt) {
00046 case PIX_FMT_RGB24:
00047 break;
00048 case PIX_FMT_RGBA:
00049 s->descriptor = 51;
00050 break;
00051 case PIX_FMT_RGB48LE:
00052 s->big_endian = 0;
00053 case PIX_FMT_RGB48BE:
00054 s->bits_per_component = avctx->bits_per_raw_sample ? avctx->bits_per_raw_sample : 16;
00055 break;
00056 default:
00057 av_log(avctx, AV_LOG_INFO, "unsupported pixel format\n");
00058 return -1;
00059 }
00060
00061 return 0;
00062 }
00063
00064 #define write16(p, value) \
00065 do { \
00066 if (s->big_endian) AV_WB16(p, value); \
00067 else AV_WL16(p, value); \
00068 } while(0)
00069
00070 #define write32(p, value) \
00071 do { \
00072 if (s->big_endian) AV_WB32(p, value); \
00073 else AV_WL32(p, value); \
00074 } while(0)
00075
00076 static void encode_rgb48_10bit(AVCodecContext *avctx, const AVPicture *pic,
00077 uint8_t *dst)
00078 {
00079 DPXContext *s = avctx->priv_data;
00080 const uint8_t *src = pic->data[0];
00081 int x, y;
00082
00083 for (y = 0; y < avctx->height; y++) {
00084 for (x = 0; x < avctx->width; x++) {
00085 int value;
00086 if ((avctx->pix_fmt & 1)) {
00087 value = ((AV_RB16(src + 6*x + 4) & 0xFFC0) >> 4)
00088 | ((AV_RB16(src + 6*x + 2) & 0xFFC0) << 6)
00089 | ((AV_RB16(src + 6*x + 0) & 0xFFC0) << 16);
00090 } else {
00091 value = ((AV_RL16(src + 6*x + 4) & 0xFFC0) >> 4)
00092 | ((AV_RL16(src + 6*x + 2) & 0xFFC0) << 6)
00093 | ((AV_RL16(src + 6*x + 0) & 0xFFC0) << 16);
00094 }
00095 write32(dst, value);
00096 dst += 4;
00097 }
00098 src += pic->linesize[0];
00099 }
00100 }
00101
00102 static int encode_frame(AVCodecContext *avctx, unsigned char *buf,
00103 int buf_size, void *data)
00104 {
00105 DPXContext *s = avctx->priv_data;
00106 int size;
00107
00108 #define HEADER_SIZE 1664
00109 if (buf_size < HEADER_SIZE)
00110 return -1;
00111
00112 memset(buf, 0, HEADER_SIZE);
00113
00114
00115 write32(buf, MKBETAG('S','D','P','X'));
00116 write32(buf + 4, HEADER_SIZE);
00117 memcpy (buf + 8, "V1.0", 4);
00118 write32(buf + 20, 1);
00119 write32(buf + 24, HEADER_SIZE);
00120 memcpy (buf + 160, LIBAVCODEC_IDENT, FFMIN(sizeof(LIBAVCODEC_IDENT), 100));
00121 write32(buf + 660, 0xFFFFFFFF);
00122
00123
00124 write16(buf + 768, 0);
00125 write16(buf + 770, 1);
00126 write32(buf + 772, avctx->width);
00127 write32(buf + 776, avctx->height);
00128 buf[800] = s->descriptor;
00129 buf[801] = 2;
00130 buf[802] = 2;
00131 buf[803] = s->bits_per_component;
00132 write16(buf + 804, s->bits_per_component == 10 ? 1 : 0);
00133
00134
00135 write32(buf + 1628, avctx->sample_aspect_ratio.num);
00136 write32(buf + 1632, avctx->sample_aspect_ratio.den);
00137
00138 switch (s->bits_per_component) {
00139 case 8:
00140 case 16:
00141 size = avpicture_layout(data, avctx->pix_fmt,
00142 avctx->width, avctx->height,
00143 buf + HEADER_SIZE, buf_size - HEADER_SIZE);
00144 if (size < 0)
00145 return size;
00146 break;
00147 case 10:
00148 size = avctx->height * avctx->width * 4;
00149 if (buf_size < HEADER_SIZE + size)
00150 return -1;
00151 encode_rgb48_10bit(avctx, data, buf + HEADER_SIZE);
00152 break;
00153 default:
00154 av_log(avctx, AV_LOG_ERROR, "Unsupported bit depth: %d\n", s->bits_per_component);
00155 return -1;
00156 }
00157
00158 size += HEADER_SIZE;
00159
00160 write32(buf + 16, size);
00161 return size;
00162 }
00163
00164 AVCodec ff_dpx_encoder = {
00165 .name = "dpx",
00166 .type = AVMEDIA_TYPE_VIDEO,
00167 .id = CODEC_ID_DPX,
00168 .priv_data_size = sizeof(DPXContext),
00169 .init = encode_init,
00170 .encode = encode_frame,
00171 .pix_fmts = (const enum PixelFormat[]){
00172 PIX_FMT_RGB24,
00173 PIX_FMT_RGBA,
00174 PIX_FMT_RGB48LE,
00175 PIX_FMT_RGB48BE,
00176 PIX_FMT_NONE},
00177 .long_name = NULL_IF_CONFIG_SMALL("DPX image"),
00178 };