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svq1: deMpegEncContextize

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This decoder is quite simple and none of the MpegEncContext complexity
is actually needed.
This commit is contained in:
Anton Khirnov 2012-12-07 17:10:01 +01:00
parent 42b5688d5e
commit 95baf701db
1 changed files with 106 additions and 67 deletions
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173
libavcodec/svq1dec.c
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@ -34,7 +34,8 @@
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "get_bits.h"
#include "internal.h"
#include "mathops.h"
#include "svq1.h"
@ -56,6 +57,16 @@ typedef struct svq1_pmv_s {
int y;
} svq1_pmv;
typedef struct SVQ1Context {
DSPContext dsp;
GetBitContext gb;
AVFrame *cur, *prev;
int width;
int height;
int frame_code;
int nonref; // 1 if the current frame won't be referenced
} SVQ1Context;
static const uint8_t string_table[256] = {
0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54,
0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D,
@ -313,7 +324,7 @@ static void svq1_skip_block(uint8_t *current, uint8_t *previous,
}
}
static int svq1_motion_inter_block(MpegEncContext *s, GetBitContext *bitbuf,
static int svq1_motion_inter_block(DSPContext *dsp, GetBitContext *bitbuf,
uint8_t *current, uint8_t *previous,
int pitch, svq1_pmv *motion, int x, int y)
{
@ -353,12 +364,12 @@ static int svq1_motion_inter_block(MpegEncContext *s, GetBitContext *bitbuf,
src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];
dst = current;
s->dsp.put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
dsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
return 0;
}
static int svq1_motion_inter_4v_block(MpegEncContext *s, GetBitContext *bitbuf,
static int svq1_motion_inter_4v_block(DSPContext *dsp, GetBitContext *bitbuf,
uint8_t *current, uint8_t *previous,
int pitch, svq1_pmv *motion, int x, int y)
{
@ -428,7 +439,7 @@ static int svq1_motion_inter_4v_block(MpegEncContext *s, GetBitContext *bitbuf,
src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];
dst = current;
s->dsp.put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
dsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
/* select next block */
if (i & 1)
@ -440,7 +451,8 @@ static int svq1_motion_inter_4v_block(MpegEncContext *s, GetBitContext *bitbuf,
return 0;
}
static int svq1_decode_delta_block(MpegEncContext *s, GetBitContext *bitbuf,
static int svq1_decode_delta_block(AVCodecContext *avctx, DSPContext *dsp,
GetBitContext *bitbuf,
uint8_t *current, uint8_t *previous,
int pitch, svq1_pmv *motion, int x, int y)
{
@ -466,23 +478,22 @@ static int svq1_decode_delta_block(MpegEncContext *s, GetBitContext *bitbuf,
break;
case SVQ1_BLOCK_INTER:
result = svq1_motion_inter_block(s, bitbuf, current, previous,
result = svq1_motion_inter_block(dsp, bitbuf, current, previous,
pitch, motion, x, y);
if (result != 0) {
av_dlog(s->avctx, "Error in svq1_motion_inter_block %i\n", result);
av_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
break;
}
result = svq1_decode_block_non_intra(bitbuf, current, pitch);
break;
case SVQ1_BLOCK_INTER_4V:
result = svq1_motion_inter_4v_block(s, bitbuf, current, previous,
result = svq1_motion_inter_4v_block(dsp, bitbuf, current, previous,
pitch, motion, x, y);
if (result != 0) {
av_dlog(s->avctx,
"Error in svq1_motion_inter_4v_block %i\n", result);
av_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
break;
}
result = svq1_decode_block_non_intra(bitbuf, current, pitch);
@ -510,36 +521,49 @@ static void svq1_parse_string(GetBitContext *bitbuf, uint8_t *out)
}
}
static int svq1_decode_frame_header(GetBitContext *bitbuf, MpegEncContext *s)
static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame)
{
SVQ1Context *s = avctx->priv_data;
GetBitContext *bitbuf = &s->gb;
int frame_size_code;
skip_bits(bitbuf, 8); /* temporal_reference */
/* frame type */
s->pict_type = get_bits(bitbuf, 2) + 1;
if (s->pict_type == 4)
return -1;
s->nonref = 0;
switch (get_bits(bitbuf, 2)) {
case 0:
frame->pict_type = AV_PICTURE_TYPE_I;
break;
case 2:
s->nonref = 1;
case 1:
frame->pict_type = AV_PICTURE_TYPE_P;
break;
default:
av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n");
return AVERROR_INVALIDDATA;
}
if (s->pict_type == AV_PICTURE_TYPE_I) {
if (frame->pict_type == AV_PICTURE_TYPE_I) {
/* unknown fields */
if (s->f_code == 0x50 || s->f_code == 0x60) {
if (s->frame_code == 0x50 || s->frame_code == 0x60) {
int csum = get_bits(bitbuf, 16);
csum = ff_svq1_packet_checksum(bitbuf->buffer,
bitbuf->size_in_bits >> 3,
csum);
av_dlog(s->avctx, "%s checksum (%02x) for packet data\n",
av_dlog(avctx, "%s checksum (%02x) for packet data\n",
(csum == 0) ? "correct" : "incorrect", csum);
}
if ((s->f_code ^ 0x10) >= 0x50) {
if ((s->frame_code ^ 0x10) >= 0x50) {
uint8_t msg[256];
svq1_parse_string(bitbuf, msg);
av_log(s->avctx, AV_LOG_INFO,
av_log(avctx, AV_LOG_INFO,
"embedded message: \"%s\"\n", (char *)msg);
}
@ -591,30 +615,33 @@ static int svq1_decode_frame(AVCodecContext *avctx, void *data,
{
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
MpegEncContext *s = avctx->priv_data;
uint8_t *current, *previous;
SVQ1Context *s = avctx->priv_data;
AVFrame *cur = s->cur;
uint8_t *current;
int result, i, x, y, width, height;
AVFrame *pict = data;
svq1_pmv *pmv;
if (cur->data[0])
avctx->release_buffer(avctx, cur);
/* initialize bit buffer */
init_get_bits(&s->gb, buf, buf_size * 8);
/* decode frame header */
s->f_code = get_bits(&s->gb, 22);
s->frame_code = get_bits(&s->gb, 22);
if ((s->f_code & ~0x70) || !(s->f_code & 0x60))
if ((s->frame_code & ~0x70) || !(s->frame_code & 0x60))
return -1;
/* swap some header bytes (why?) */
if (s->f_code != 0x20) {
if (s->frame_code != 0x20) {
uint32_t *src = (uint32_t *)(buf + 4);
for (i = 0; i < 4; i++)
src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
}
result = svq1_decode_frame_header(&s->gb, s);
result = svq1_decode_frame_header(avctx, cur);
if (result != 0) {
av_dlog(s->avctx, "Error in svq1_decode_frame_header %i\n", result);
@ -622,21 +649,15 @@ static int svq1_decode_frame(AVCodecContext *avctx, void *data,
}
avcodec_set_dimensions(avctx, s->width, s->height);
/* FIXME: This avoids some confusion for "B frames" without 2 references.
* This should be removed after libavcodec can handle more flexible
* picture types & ordering */
if (s->pict_type == AV_PICTURE_TYPE_B && s->last_picture_ptr == NULL)
return buf_size;
if ((avctx->skip_frame >= AVDISCARD_NONREF &&
s->pict_type == AV_PICTURE_TYPE_B) ||
if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||
(avctx->skip_frame >= AVDISCARD_NONKEY &&
s->pict_type != AV_PICTURE_TYPE_I) ||
cur->pict_type != AV_PICTURE_TYPE_I) ||
avctx->skip_frame >= AVDISCARD_ALL)
return buf_size;
if (ff_MPV_frame_start(s, avctx) < 0)
return -1;
result = ff_get_buffer(avctx, cur);
if (result < 0)
return result;
pmv = av_malloc((FFALIGN(s->width, 16) / 8 + 3) * sizeof(*pmv));
if (!pmv)
@ -644,34 +665,27 @@ static int svq1_decode_frame(AVCodecContext *avctx, void *data,
/* decode y, u and v components */
for (i = 0; i < 3; i++) {
int linesize;
int linesize = cur->linesize[i];
if (i == 0) {
width = FFALIGN(s->width, 16);
height = FFALIGN(s->height, 16);
linesize = s->linesize;
} else {
if (s->flags & CODEC_FLAG_GRAY)
if (avctx->flags & CODEC_FLAG_GRAY)
break;
width = FFALIGN(s->width / 4, 16);
height = FFALIGN(s->height / 4, 16);
linesize = s->uvlinesize;
}
current = s->current_picture.f.data[i];
current = cur->data[i];
if (s->pict_type == AV_PICTURE_TYPE_B)
previous = s->next_picture.f.data[i];
else
previous = s->last_picture.f.data[i];
if (s->pict_type == AV_PICTURE_TYPE_I) {
if (cur->pict_type == AV_PICTURE_TYPE_I) {
/* keyframe */
for (y = 0; y < height; y += 16) {
for (x = 0; x < width; x += 16) {
result = svq1_decode_block_intra(&s->gb, &current[x],
linesize);
if (result != 0) {
av_log(s->avctx, AV_LOG_INFO,
av_log(avctx, AV_LOG_INFO,
"Error in svq1_decode_block %i (keyframe)\n",
result);
goto err;
@ -681,11 +695,19 @@ static int svq1_decode_frame(AVCodecContext *avctx, void *data,
}
} else {
/* delta frame */
uint8_t *previous = s->prev->data[i];
if (!previous) {
av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
result = AVERROR_INVALIDDATA;
goto err;
}
memset(pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));
for (y = 0; y < height; y += 16) {
for (x = 0; x < width; x += 16) {
result = svq1_decode_delta_block(s, &s->gb, &current[x],
result = svq1_decode_delta_block(avctx, &s->dsp,
&s->gb, &current[x],
previous, linesize,
pmv, x, y);
if (result != 0) {
@ -704,9 +726,9 @@ static int svq1_decode_frame(AVCodecContext *avctx, void *data,
}
}
*pict = s->current_picture.f;
ff_MPV_frame_end(s);
*(AVFrame*)data = *cur;
if (!s->nonref)
FFSWAP(AVFrame*, s->cur, s->prev);
*got_frame = 1;
result = buf_size;
@ -718,22 +740,23 @@ err:
static av_cold int svq1_decode_init(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
SVQ1Context *s = avctx->priv_data;
int i;
int offset = 0;
ff_MPV_decode_defaults(s);
s->cur = avcodec_alloc_frame();
s->prev = avcodec_alloc_frame();
if (!s->cur || !s->prev) {
avcodec_free_frame(&s->cur);
avcodec_free_frame(&s->prev);
return AVERROR(ENOMEM);
}
s->avctx = avctx;
s->width = avctx->width + 3 & ~3;
s->height = avctx->height + 3 & ~3;
s->codec_id = avctx->codec->id;
avctx->pix_fmt = AV_PIX_FMT_YUV410P;
/* Not true, but DP frames and these behave like unidirectional B-frames. */
avctx->has_b_frames = 1;
s->flags = avctx->flags;
if (ff_MPV_common_init(s) < 0)
return -1;
ff_dsputil_init(&s->dsp, avctx);
INIT_VLC_STATIC(&svq1_block_type, 2, 4,
&ff_svq1_block_type_vlc[0][1], 2, 1,
@ -776,22 +799,38 @@ static av_cold int svq1_decode_init(AVCodecContext *avctx)
static av_cold int svq1_decode_end(AVCodecContext *avctx)
{
MpegEncContext *s = avctx->priv_data;
SVQ1Context *s = avctx->priv_data;
if (s->cur->data[0])
avctx->release_buffer(avctx, s->cur);
if (s->prev->data[0])
avctx->release_buffer(avctx, s->prev);
avcodec_free_frame(&s->cur);
avcodec_free_frame(&s->prev);
ff_MPV_common_end(s);
return 0;
}
static void svq1_flush(AVCodecContext *avctx)
{
SVQ1Context *s = avctx->priv_data;
if (s->cur->data[0])
avctx->release_buffer(avctx, s->cur);
if (s->prev->data[0])
avctx->release_buffer(avctx, s->prev);
}
AVCodec ff_svq1_decoder = {
.name = "svq1",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_SVQ1,
.priv_data_size = sizeof(MpegEncContext),
.priv_data_size = sizeof(SVQ1Context),
.init = svq1_decode_init,
.close = svq1_decode_end,
.decode = svq1_decode_frame,
.capabilities = CODEC_CAP_DR1,
.flush = ff_mpeg_flush,
.flush = svq1_flush,
.pix_fmts = (const enum PixelFormat[]) { AV_PIX_FMT_YUV410P,
AV_PIX_FMT_NONE },
.long_name = NULL_IF_CONFIG_SMALL("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),