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avcodec/hap: add "compressor" option to Hap encoder to disable secondary compression

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The secondary compression in Hap is optional, this change exposes that option to
the user as some use-cases favour higher bitrate files to reduce workload
decoding.
Adds "none" or "snappy" as options for "compressor". Selecting "none" disregards
"chunks" option: chunking is only of benefit decompressing Snappy.

Reviewed-by: Martin Vignali <martin.vignali@gmail.com>
Signed-off-by: Tom Butterworth <bangnoise@gmail.com>
This commit is contained in:
Tom Butterworth 2016-11-07 23:58:48 +00:00
parent 08be65a075
commit bd6fa80d56
2 changed files with 46 additions and 18 deletions
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1
libavcodec/hap.h
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@ -65,6 +65,7 @@ typedef struct HapContext {
enum HapTextureFormat opt_tex_fmt; /* Texture type (encoder only) */
int opt_chunk_count; /* User-requested chunk count (encoder only) */
int opt_compressor; /* User-requested compressor (encoder only) */
int chunk_count;
HapChunk *chunks;

63
libavcodec/hapenc.c
View File

@ -204,15 +204,25 @@ static int hap_encode(AVCodecContext *avctx, AVPacket *pkt,
if (ret < 0)
return ret;
/* DXTC compression. */
ret = compress_texture(avctx, ctx->tex_buf, ctx->tex_size, frame);
if (ret < 0)
return ret;
if (ctx->opt_compressor == HAP_COMP_NONE) {
/* DXTC compression directly to the packet buffer. */
ret = compress_texture(avctx, pkt->data + header_length, pkt->size - header_length, frame);
if (ret < 0)
return ret;
/* Compress (using Snappy) the frame */
final_data_size = hap_compress_frame(avctx, pkt->data + header_length);
if (final_data_size < 0)
return final_data_size;
ctx->chunks[0].compressor = HAP_COMP_NONE;
final_data_size = ctx->tex_size;
} else {
/* DXTC compression. */
ret = compress_texture(avctx, ctx->tex_buf, ctx->tex_size, frame);
if (ret < 0)
return ret;
/* Compress (using Snappy) the frame */
final_data_size = hap_compress_frame(avctx, pkt->data + header_length);
if (final_data_size < 0)
return final_data_size;
}
/* Write header at the start. */
hap_write_frame_header(ctx, pkt->data, final_data_size + header_length);
@ -273,10 +283,30 @@ static av_cold int hap_init(AVCodecContext *avctx)
ctx->tex_size = FFALIGN(avctx->width, TEXTURE_BLOCK_W) *
FFALIGN(avctx->height, TEXTURE_BLOCK_H) * 4 / ratio;
/* Round the chunk count to divide evenly on DXT block edges */
corrected_chunk_count = av_clip(ctx->opt_chunk_count, 1, HAP_MAX_CHUNKS);
while ((ctx->tex_size / (64 / ratio)) % corrected_chunk_count != 0) {
corrected_chunk_count--;
switch (ctx->opt_compressor) {
case HAP_COMP_NONE:
/* No benefit chunking uncompressed data */
corrected_chunk_count = 1;
ctx->max_snappy = ctx->tex_size;
ctx->tex_buf = NULL;
break;
case HAP_COMP_SNAPPY:
/* Round the chunk count to divide evenly on DXT block edges */
corrected_chunk_count = av_clip(ctx->opt_chunk_count, 1, HAP_MAX_CHUNKS);
while ((ctx->tex_size / (64 / ratio)) % corrected_chunk_count != 0) {
corrected_chunk_count--;
}
ctx->max_snappy = snappy_max_compressed_length(ctx->tex_size / corrected_chunk_count);
ctx->tex_buf = av_malloc(ctx->tex_size);
if (!ctx->tex_buf) {
return AVERROR(ENOMEM);
}
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid compresor %02X\n", ctx->opt_compressor);
return AVERROR_INVALIDDATA;
}
if (corrected_chunk_count != ctx->opt_chunk_count) {
av_log(avctx, AV_LOG_INFO, "%d chunks requested but %d used.\n",
@ -286,12 +316,6 @@ static av_cold int hap_init(AVCodecContext *avctx)
if (ret != 0)
return ret;
ctx->max_snappy = snappy_max_compressed_length(ctx->tex_size / corrected_chunk_count);
ctx->tex_buf = av_malloc(ctx->tex_size);
if (!ctx->tex_buf)
return AVERROR(ENOMEM);
return 0;
}
@ -312,6 +336,9 @@ static const AVOption options[] = {
{ "hap_alpha", "Hap Alpha (DXT5 textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_RGBADXT5 }, 0, 0, FLAGS, "format" },
{ "hap_q", "Hap Q (DXT5-YCoCg textures)", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_FMT_YCOCGDXT5 }, 0, 0, FLAGS, "format" },
{ "chunks", "chunk count", OFFSET(opt_chunk_count), AV_OPT_TYPE_INT, {.i64 = 1 }, 1, HAP_MAX_CHUNKS, FLAGS, },
{ "compressor", "second-stage compressor", OFFSET(opt_compressor), AV_OPT_TYPE_INT, { .i64 = HAP_COMP_SNAPPY }, HAP_COMP_NONE, HAP_COMP_SNAPPY, FLAGS, "compressor" },
{ "none", "None", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_COMP_NONE }, 0, 0, FLAGS, "compressor" },
{ "snappy", "Snappy", 0, AV_OPT_TYPE_CONST, { .i64 = HAP_COMP_SNAPPY }, 0, 0, FLAGS, "compressor" },
{ NULL },
};