[FFmpeg-devel] [PATCH v2 1/2] avcodec: add an APV parser

[James Almer <jamrial@gmail.com>]

Signed-off-by: James Almer <jamrial@gmail.com>
---
Now working if the first AU is not a primary frame.

 configure               |   1 +
 libavcodec/Makefile     |   1 +
 libavcodec/apv_parser.c | 133 ++++++++++++++++++++++++++++++++++++++++
 libavcodec/parsers.c    |   1 +
 4 files changed, 136 insertions(+)
 create mode 100644 libavcodec/apv_parser.c

diff --git a/configure b/configure
index ee270b770c..d8c2786dc8 100755
--- a/configure
+++ b/configure
@@ -3483,6 +3483,7 @@ vvc_qsv_decoder_select="vvc_mp4toannexb_bsf qsvdec"
 
 # parsers
 aac_parser_select="adts_header mpeg4audio"
+apv_parser_select="cbs_apv"
 av1_parser_select="cbs_av1"
 evc_parser_select="evcparse"
 ffv1_parser_select="rangecoder"
diff --git a/libavcodec/Makefile b/libavcodec/Makefile
index e674671460..cc142bbae2 100644
--- a/libavcodec/Makefile
+++ b/libavcodec/Makefile
@@ -1198,6 +1198,7 @@ OBJS-$(CONFIG_AC3_PARSER)              += aac_ac3_parser.o ac3tab.o \
                                           ac3_channel_layout_tab.o
 OBJS-$(CONFIG_ADX_PARSER)              += adx_parser.o
 OBJS-$(CONFIG_AMR_PARSER)              += amr_parser.o
+OBJS-$(CONFIG_APV_PARSER)              += apv_parser.o
 OBJS-$(CONFIG_AV1_PARSER)              += av1_parser.o av1_parse.o
 OBJS-$(CONFIG_AVS2_PARSER)             += avs2.o avs2_parser.o
 OBJS-$(CONFIG_AVS3_PARSER)             += avs3_parser.o
diff --git a/libavcodec/apv_parser.c b/libavcodec/apv_parser.c
new file mode 100644
index 0000000000..bd1894146c
--- /dev/null
+++ b/libavcodec/apv_parser.c
@@ -0,0 +1,133 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "avcodec.h"
+#include "apv.h"
+#include "cbs.h"
+#include "cbs_apv.h"
+
+typedef struct APVParseContext {
+    CodedBitstreamContext *cbc;
+    CodedBitstreamFragment au;
+} APVParseContext;
+
+static const enum AVPixelFormat apv_format_table[5][5] = {
+    { AV_PIX_FMT_GRAY8,    AV_PIX_FMT_GRAY10,     AV_PIX_FMT_GRAY12,     AV_PIX_FMT_GRAY14, AV_PIX_FMT_GRAY16 },
+    { 0 }, // 4:2:0 is not valid.
+    { AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV422P10,  AV_PIX_FMT_YUV422P12,  AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUV422P16 },
+    { AV_PIX_FMT_YUV444P,  AV_PIX_FMT_YUV444P10,  AV_PIX_FMT_YUV444P12,  AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUV444P16 },
+    { AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA444P10, AV_PIX_FMT_YUVA444P12, AV_PIX_FMT_GRAY14, AV_PIX_FMT_YUVA444P16 },
+};
+
+static int parse(AVCodecParserContext *s,
+                 AVCodecContext *avctx,
+                 const uint8_t **poutbuf, int *poutbuf_size,
+                 const uint8_t *buf, int buf_size)
+{
+    APVParseContext *p = s->priv_data;
+    CodedBitstreamFragment *au = &p->au;
+    int ret;
+
+    *poutbuf      = buf;
+    *poutbuf_size = buf_size;
+
+    p->cbc->log_ctx = avctx;
+
+    ret = ff_cbs_read(p->cbc, au, buf, buf_size);
+    if (ret < 0) {
+        av_log(avctx, AV_LOG_ERROR, "Failed to parse access unit.\n");
+        goto end;
+    }
+
+    s->key_frame         = 1;
+    s->pict_type         = AV_PICTURE_TYPE_I;
+    s->field_order       = AV_FIELD_UNKNOWN;
+    s->picture_structure = AV_PICTURE_STRUCTURE_FRAME;
+
+    for (int i = 0; i < au->nb_units; i++) {
+        const CodedBitstreamUnit *pbu = &au->units[i];
+
+        switch (pbu->type) {
+        case APV_PBU_PRIMARY_FRAME: {
+            const APVRawFrame *frame        = pbu->content;
+            const APVRawFrameHeader *header = &frame->frame_header;
+            const APVRawFrameInfo *info     = &header->frame_info;
+            int bit_depth = info->bit_depth_minus8 + 8;
+
+            if (bit_depth < 8 || bit_depth > 16 || bit_depth % 2)
+                break;
+
+            s->width                        = info->frame_width;
+            s->height                       = info->frame_height;
+            s->format                       = apv_format_table[info->chroma_format_idc][bit_depth - 4 >> 2];
+            avctx->profile                  = info->profile_idc;
+            avctx->level                    = info->level_idc;
+            avctx->chroma_sample_location   = AVCHROMA_LOC_TOPLEFT;
+            avctx->color_primaries          = header->color_primaries;
+            avctx->color_trc                = header->transfer_characteristics;
+            avctx->colorspace               = header->matrix_coefficients;
+            avctx->color_range              = header->full_range_flag ? AVCOL_RANGE_JPEG
+                                                                      : AVCOL_RANGE_MPEG;
+            goto end;
+        }
+        default:
+            break;
+        }
+    }
+
+end:
+    ff_cbs_fragment_reset(au);
+    p->cbc->log_ctx = NULL;
+
+    return buf_size;
+}
+
+static const CodedBitstreamUnitType decompose_unit_types[] = {
+    APV_PBU_PRIMARY_FRAME,
+};
+
+static av_cold int init(AVCodecParserContext *s)
+{
+    APVParseContext *p = s->priv_data;
+    int ret;
+
+    ret = ff_cbs_init(&p->cbc, AV_CODEC_ID_APV, NULL);
+    if (ret < 0)
+        return ret;
+
+    p->cbc->decompose_unit_types    = decompose_unit_types;
+    p->cbc->nb_decompose_unit_types = FF_ARRAY_ELEMS(decompose_unit_types);
+
+    return 0;
+}
+
+static void close(AVCodecParserContext *s)
+{
+    APVParseContext *p = s->priv_data;
+
+    ff_cbs_fragment_free(&p->au);
+    ff_cbs_close(&p->cbc);
+}
+
+const AVCodecParser ff_apv_parser = {
+    .codec_ids    = { AV_CODEC_ID_APV },
+    .priv_data_size = sizeof(APVParseContext),
+    .parser_init  = init,
+    .parser_parse = parse,
+    .parser_close = close,
+};
diff --git a/libavcodec/parsers.c b/libavcodec/parsers.c
index 5387351fd0..21164f3751 100644
--- a/libavcodec/parsers.c
+++ b/libavcodec/parsers.c
@@ -25,6 +25,7 @@ extern const AVCodecParser ff_aac_latm_parser;
 extern const AVCodecParser ff_ac3_parser;
 extern const AVCodecParser ff_adx_parser;
 extern const AVCodecParser ff_amr_parser;
+extern const AVCodecParser ff_apv_parser;
 extern const AVCodecParser ff_av1_parser;
 extern const AVCodecParser ff_avs2_parser;
 extern const AVCodecParser ff_avs3_parser;
-- 
2.49.0

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