mmaldec: Add mpeg2 decoding support

Register mmaldec as mpeg2 decoder. Supporting mpeg2 in mmaldec is just a
matter of setting the correct MMAL_ENCODING on the input port. To ease the
addition of further supported mmal codecs a macro is introduced to generate
the decoder and decoder class structs.
Signed-off-by: Julian Scheel <julian@jusst.de>
Signed-off-by: wm4 <nfxjfg@googlemail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Changelog

@@ -55,6 +55,7 @@ version <next>:
 - libnpp/CUDA-accelerated format conversion and scaling
 - VAAPI-accelerate H.264/HEVC/MJPEG encoding
 - Generic OpenMAX IL encoder with support for Raspberry Pi
+- MMAL-accelerated MPEG-2 decoding
 
 
 version 11:

configure

@@ -2133,6 +2133,9 @@ mpeg2_d3d11va_hwaccel_deps="d3d11va"
 mpeg2_d3d11va_hwaccel_select="mpeg2video_decoder"
 mpeg2_dxva2_hwaccel_deps="dxva2"
 mpeg2_dxva2_hwaccel_select="mpeg2video_decoder"
+mpeg2_mmal_decoder_deps="mmal"
+mpeg2_mmal_hwaccel_deps="mmal"
+mpeg2_mmal_decoder_select="mpeg2video_decoder"
 mpeg2_qsv_hwaccel_deps="libmfx"
 mpeg2_vaapi_hwaccel_deps="vaapi"
 mpeg2_vaapi_hwaccel_select="mpeg2video_decoder"

libavcodec/Makefile

@@ -314,6 +314,7 @@ OBJS-$(CONFIG_MPEG1VIDEO_DECODER)      += mpeg12dec.o mpeg12.o mpeg12data.o
 OBJS-$(CONFIG_MPEG1VIDEO_ENCODER)      += mpeg12enc.o mpeg12.o
 OBJS-$(CONFIG_MPEG2VIDEO_DECODER)      += mpeg12dec.o mpeg12.o mpeg12data.o
 OBJS-$(CONFIG_MPEG2VIDEO_ENCODER)      += mpeg12enc.o mpeg12.o
+OBJS-$(CONFIG_MPEG2_MMAL_DECODER)      += mmaldec.o
 OBJS-$(CONFIG_MPEG4_DECODER)           += xvididct.o
 OBJS-$(CONFIG_MSA1_DECODER)            += mss3.o
 OBJS-$(CONFIG_MSMPEG4V1_DECODER)       += msmpeg4dec.o msmpeg4.o msmpeg4data.o

libavcodec/allcodecs.c

@@ -83,6 +83,7 @@ void avcodec_register_all(void)
     REGISTER_HWACCEL(MPEG1_VDPAU,       mpeg1_vdpau);
     REGISTER_HWACCEL(MPEG2_D3D11VA,     mpeg2_d3d11va);
     REGISTER_HWACCEL(MPEG2_DXVA2,       mpeg2_dxva2);
+    REGISTER_HWACCEL(MPEG2_MMAL,        mpeg2_mmal);
     REGISTER_HWACCEL(MPEG2_QSV,         mpeg2_qsv);
     REGISTER_HWACCEL(MPEG2_VAAPI,       mpeg2_vaapi);
     REGISTER_HWACCEL(MPEG2_VDPAU,       mpeg2_vdpau);
@@ -200,6 +201,7 @@ void avcodec_register_all(void)
 #endif /* FF_API_XVMC */
     REGISTER_ENCDEC (MPEG1VIDEO,        mpeg1video);
     REGISTER_ENCDEC (MPEG2VIDEO,        mpeg2video);
+    REGISTER_DECODER(MPEG2_MMAL,        mpeg2_mmal);
     REGISTER_DECODER(MPEG2_QSV,         mpeg2_qsv);
     REGISTER_ENCDEC (MPEG4,             mpeg4);
     REGISTER_DECODER(MSA1,              msa1);

libavcodec/mmaldec.c

@@ -351,7 +351,17 @@ static av_cold int ffmmal_init_decoder(AVCodecContext *avctx)
 
     format_in = decoder->input[0]->format;
     format_in->type = MMAL_ES_TYPE_VIDEO;
-    format_in->encoding = MMAL_ENCODING_H264;
+    switch (avctx->codec_id) {
+    case AV_CODEC_ID_MPEG2VIDEO:
+        format_in->encoding = MMAL_ENCODING_MP2V;
+        av_log(avctx, AV_LOG_DEBUG, "Use MMAL MP2V encoding\n");
+        break;
+    case AV_CODEC_ID_H264:
+    default:
+        format_in->encoding = MMAL_ENCODING_H264;
+        av_log(avctx, AV_LOG_DEBUG, "Use MMAL H264 encoding\n");
+        break;
+    }
     format_in->es->video.width = FFALIGN(avctx->width, 32);
     format_in->es->video.height = FFALIGN(avctx->height, 16);
     format_in->es->video.crop.width = avctx->width;
@@ -760,31 +770,44 @@ AVHWAccel ff_h264_mmal_hwaccel = {
     .pix_fmt    = AV_PIX_FMT_MMAL,
 };
 
+AVHWAccel ff_mpeg2_mmal_hwaccel = {
+    .name       = "mpeg2_mmal",
+    .type       = AVMEDIA_TYPE_VIDEO,
+    .id         = AV_CODEC_ID_MPEG2VIDEO,
+    .pix_fmt    = AV_PIX_FMT_MMAL,
+};
+
 static const AVOption options[]={
     {"extra_buffers", "extra buffers", offsetof(MMALDecodeContext, extra_buffers), AV_OPT_TYPE_INT, {.i64 = 10}, 0, 256, 0},
     {NULL}
 };
 
-static const AVClass ffmmaldec_class = {
-    .class_name = "mmaldec",
-    .option     = options,
-    .version    = LIBAVUTIL_VERSION_INT,
-};
-
-AVCodec ff_h264_mmal_decoder = {
-    .name           = "h264_mmal",
-    .long_name      = NULL_IF_CONFIG_SMALL("h264 (mmal)"),
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_H264,
-    .priv_data_size = sizeof(MMALDecodeContext),
-    .init           = ffmmal_init_decoder,
-    .close          = ffmmal_close_decoder,
-    .decode         = ffmmal_decode,
-    .flush          = ffmmal_flush,
-    .priv_class     = &ffmmaldec_class,
-    .capabilities   = AV_CODEC_CAP_DELAY,
-    .caps_internal  = FF_CODEC_CAP_SETS_PKT_DTS,
-    .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL,
-                                                     AV_PIX_FMT_YUV420P,
-                                                     AV_PIX_FMT_NONE},
-};
+#define FFMMAL_DEC_CLASS(NAME) \
+    static const AVClass ffmmal_##NAME##_dec_class = { \
+        .class_name = "mmal_" #NAME "_dec", \
+        .option     = options, \
+        .version    = LIBAVUTIL_VERSION_INT, \
+    };
+
+#define FFMMAL_DEC(NAME, ID) \
+    FFMMAL_DEC_CLASS(NAME) \
+    AVCodec ff_##NAME##_mmal_decoder = { \
+        .name           = #NAME "_mmal", \
+        .long_name      = NULL_IF_CONFIG_SMALL(#NAME " (mmal)"), \
+        .type           = AVMEDIA_TYPE_VIDEO, \
+        .id             = ID, \
+        .priv_data_size = sizeof(MMALDecodeContext), \
+        .init           = ffmmal_init_decoder, \
+        .close          = ffmmal_close_decoder, \
+        .decode         = ffmmal_decode, \
+        .flush          = ffmmal_flush, \
+        .priv_class     = &ffmmal_##NAME##_dec_class, \
+        .capabilities   = AV_CODEC_CAP_DELAY, \
+        .caps_internal  = FF_CODEC_CAP_SETS_PKT_DTS, \
+        .pix_fmts       = (const enum AVPixelFormat[]) { AV_PIX_FMT_MMAL, \
+                                                         AV_PIX_FMT_YUV420P, \
+                                                         AV_PIX_FMT_NONE}, \
+    };
+
+FFMMAL_DEC(h264, AV_CODEC_ID_H264)
+FFMMAL_DEC(mpeg2, AV_CODEC_ID_MPEG2VIDEO)

libavcodec/version.h

@@ -28,8 +28,8 @@
 #include "libavutil/version.h"
 
 #define LIBAVCODEC_VERSION_MAJOR 57
-#define LIBAVCODEC_VERSION_MINOR 18
-#define LIBAVCODEC_VERSION_MICRO  2
+#define LIBAVCODEC_VERSION_MINOR 19
+#define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \
                                                LIBAVCODEC_VERSION_MINOR, \