static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt, const AVFrame *p, int *got_packet) { int bpp, picsize, datasize = -1, ret; uint8_t *out; if(avctx->width > 0xffff || avctx->height > 0xffff) { av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n"); return AVERROR(EINVAL); } picsize = av_image_get_buffer_size(avctx->pix_fmt, avctx->width, avctx->height, 1); if ((ret = ff_alloc_packet(pkt, picsize + 45)) < 0) { av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n"); return ret; } /* zero out the header and only set applicable fields */ memset(pkt->data, 0, 12); AV_WL16(pkt->data+12, avctx->width); AV_WL16(pkt->data+14, avctx->height); /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */ pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0); switch(avctx->pix_fmt) { case AV_PIX_FMT_GRAY8: pkt->data[2] = TGA_BW; /* uncompressed grayscale image */ pkt->data[16] = 8; /* bpp */ break; case AV_PIX_FMT_RGB555LE: pkt->data[2] = TGA_RGB; /* uncompresses true-color image */ pkt->data[16] = 16; /* bpp */ break; case AV_PIX_FMT_BGR24: pkt->data[2] = TGA_RGB; /* uncompressed true-color image */ pkt->data[16] = 24; /* bpp */ break; case AV_PIX_FMT_BGRA: pkt->data[2] = TGA_RGB; /* uncompressed true-color image */ pkt->data[16] = 32; /* bpp */ break; default: av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n", av_get_pix_fmt_name(avctx->pix_fmt)); return AVERROR(EINVAL); } bpp = pkt->data[16] >> 3; out = pkt->data + 18; /* skip past the header we just output */ /* try RLE compression */ if (avctx->coder_type != FF_CODER_TYPE_RAW) datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height); /* if that worked well, mark the picture as RLE compressed */ if(datasize >= 0) pkt->data[2] |= 8; /* if RLE didn't make it smaller, go back to no compression */ else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height); out += datasize; /* The standard recommends including this section, even if we don't use * any of the features it affords. TODO: take advantage of the pixel * aspect ratio and encoder ID fields available? */ memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26); pkt->size = out + 26 - pkt->data; pkt->flags |= AV_PKT_FLAG_KEY; *got_packet = 1; return 0; }