[media] hdmi: added functions for MPEG InfoFrames

Message ID	1447526299-4222-1-git-send-email-enric.balletbo@collabora.com (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-fbdev-owner@kernel.org> From: Enric Balletbo i Serra <eballetbo@gmail.com> To: linux-fbdev@vger.kernel.org Cc: Jean-Christophe Plagniol-Villard <plagnioj@jcrosoft.com>, Tomi Valkeinen <tomi.valkeinen@ti.com>, Thierry Reding <treding@nvidia.com>, Hans Verkuil <hans.verkuil@cisco.com>, Mauro Carvalho Chehab <mchehab@osg.samsung.com>, Martin Bugge <marbugge@cisco.com>, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH] [media] hdmi: added functions for MPEG InfoFrames Date: Sat, 14 Nov 2015 19:38:19 +0100 Message-Id: <1447526299-4222-1-git-send-email-enric.balletbo@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-fbdev-owner@vger.kernel.org Precedence: bulk

diff --git a/drivers/video/hdmi.c b/drivers/video/hdmi.c index 1626892..d37e821 100644 --- a/drivers/video/hdmi.c +++ b/drivers/video/hdmi.c @@ -388,6 +388,81 @@ ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame, } EXPORT_SYMBOL(hdmi_vendor_infoframe_pack); +/** + * hdmi_mpeg_infoframe_init() - initialize an HDMI MPEG infoframe + * @frame: HDMI MPEG infoframe + * + * Returns 0 on success or a negative error code on failure. + */ +int hdmi_mpeg_infoframe_init(struct hdmi_mpeg_infoframe *frame) +{ + memset(frame, 0, sizeof(*frame)); + + frame->type = HDMI_INFOFRAME_TYPE_MPEG; + frame->version = 1; + frame->length = HDMI_MPEG_INFOFRAME_SIZE; + + return 0; +} +EXPORT_SYMBOL(hdmi_mpeg_infoframe_init); + +/** + * hdmi_mpeg_infoframe_pack() - write HDMI MPEG infoframe to binary buffer + * @frame: HDMI MPEG infoframe + * @buffer: destination buffer + * @size: size of buffer + * + * Packs the information contained in the @frame structure into a binary + * representation that can be written into the corresponding controller + * registers. Also computes the checksum as required by section 5.3.5 of + * the HDMI 1.4 specification. + * + * Returns the number of bytes packed into the binary buffer or a negative + * error code on failure. + */ +ssize_t hdmi_mpeg_infoframe_pack(struct hdmi_mpeg_infoframe *frame, + void *buffer, size_t size) +{ + u8 *ptr = buffer; + size_t length; + + length = HDMI_INFOFRAME_HEADER_SIZE + frame->length; + + if (size < length) + return -ENOSPC; + + memset(buffer, 0, size); + + ptr[0] = frame->type; + ptr[1] = frame->version; + ptr[2] = frame->length; + ptr[3] = 0; /* checksum */ + + /* start infoframe payload */ + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + /* + * The MPEG Bit Rate is stored as a 32-bit number and is expressed in + * Hertz. MB#0 contains the least significant byte while MB#3 contains + * the most significant byte. If the MPEG Bit Rate is unknown or this + * field doesn’t apply, then all of the bits in Data Bytes 1-4 shall + * be set to 0. + */ + ptr[0] = frame->bitrate & 0x000000ff; + ptr[1] = (frame->bitrate & 0x0000ff00) >> 8; + ptr[2] = (frame->bitrate & 0x00ff0000) >> 16; + ptr[3] = (frame->bitrate & 0xff000000) >> 24; + + ptr[4] = frame->picture_type; + if (frame->repeated) + ptr[4] |= BIT(4); + + hdmi_infoframe_set_checksum(buffer, length); + + return length; +} +EXPORT_SYMBOL(hdmi_mpeg_infoframe_pack); + /* * hdmi_vendor_any_infoframe_pack() - write a vendor infoframe to binary buffer */ @@ -435,6 +510,8 @@ hdmi_infoframe_pack(union hdmi_infoframe *frame, void *buffer, size_t size) length = hdmi_vendor_any_infoframe_pack(&frame->vendor, buffer, size); break; + case HDMI_INFOFRAME_TYPE_MPEG: + length = hdmi_mpeg_infoframe_pack(&frame->mpeg, buffer, size); default: WARN(1, "Bad infoframe type %d\n", frame->any.type); length = -EINVAL; @@ -457,6 +534,8 @@ static const char *hdmi_infoframe_type_get_name(enum hdmi_infoframe_type type) return "Source Product Description (SPD)"; case HDMI_INFOFRAME_TYPE_AUDIO: return "Audio"; + case HDMI_INFOFRAME_TYPE_MPEG: + return "MPEG"; } return "Reserved"; } @@ -899,6 +978,41 @@ static void hdmi_audio_infoframe_log(const char *level, frame->downmix_inhibit ? "Yes" : "No"); } +static const char *hdmi_mpeg_picture_get_name(enum hdmi_mpeg_picture_type type) +{ + switch (type) { + case HDMI_MPEG_PICTURE_TYPE_UNKNOWN: + return "Unknown"; + case HDMI_MPEG_PICTURE_TYPE_I: + return "Intra-coded picture"; + case HDMI_MPEG_PICTURE_TYPE_B: + return "Bi-predictive picture"; + case HDMI_MPEG_PICTURE_TYPE_P: + return "Predicted picture"; + } + return "Reserved"; +} + +/** + * hdmi_mpeg_infoframe_log() - log info of HDMI MPEG infoframe + * @level: logging level + * @dev: device + * @frame: HDMI MPEG infoframe + */ +static void hdmi_mpeg_infoframe_log(const char *level, + struct device *dev, + struct hdmi_mpeg_infoframe *frame) +{ + hdmi_infoframe_log_header(level, dev, + (struct hdmi_any_infoframe *)frame); + + hdmi_log(" bit rate: %d Hz\n", frame->bitrate); + hdmi_log(" frame type: %s\n", + hdmi_mpeg_picture_get_name(frame->picture_type)); + hdmi_log(" repeated frame: %s\n", + frame->repeated ? "Yes" : "No"); +} + static const char * hdmi_3d_structure_get_name(enum hdmi_3d_structure s3d_struct) { @@ -987,6 +1101,9 @@ void hdmi_infoframe_log(const char *level, case HDMI_INFOFRAME_TYPE_VENDOR: hdmi_vendor_any_infoframe_log(level, dev, &frame->vendor); break; + case HDMI_INFOFRAME_TYPE_MPEG: + hdmi_mpeg_infoframe_log(level, dev, &frame->mpeg); + break; } } EXPORT_SYMBOL(hdmi_infoframe_log); @@ -1138,6 +1255,42 @@ static int hdmi_audio_infoframe_unpack(struct hdmi_audio_infoframe *frame, } /** + * hdmi_mpeg_infoframe_unpack() - unpack binary buffer to a HDMI MPEG infoframe + * @buffer: source buffer + * @frame: HDMI MPEG infoframe + * + * Unpacks the information contained in binary @buffer into a structured + * @frame of the HDMI MPEG information frame. Also verifies the checksum as + * required by section 5.3.5 of the HDMI 1.4 specification. + * + * Returns 0 on success or a negative error code on failure. + */ +static int hdmi_mpeg_infoframe_unpack(struct hdmi_mpeg_infoframe *frame, + void *buffer) +{ + u8 *ptr = buffer; + + if (ptr[0] != HDMI_INFOFRAME_TYPE_MPEG || + ptr[1] != 1 || + ptr[2] != HDMI_MPEG_INFOFRAME_SIZE) { + return -EINVAL; + } + + if (hdmi_infoframe_checksum(buffer, HDMI_INFOFRAME_SIZE(MPEG)) != 0) + return -EINVAL; + + ptr += HDMI_INFOFRAME_HEADER_SIZE; + + frame->bitrate = (ptr[3] << 24) | (ptr[2] << 16) | + (ptr[1] << 8) | ptr[0]; + + frame->picture_type = ptr[4] & 0x03; + frame->repeated = ptr[4] & BIT(4) ? true : false; + + return 0; +} + +/** * hdmi_vendor_infoframe_unpack() - unpack binary buffer to a HDMI vendor infoframe * @buffer: source buffer * @frame: HDMI Vendor infoframe @@ -1234,6 +1387,9 @@ int hdmi_infoframe_unpack(union hdmi_infoframe *frame, void *buffer) case HDMI_INFOFRAME_TYPE_VENDOR: ret = hdmi_vendor_any_infoframe_unpack(&frame->vendor, buffer); break; + case HDMI_INFOFRAME_TYPE_MPEG: + ret = hdmi_mpeg_infoframe_unpack(&frame->mpeg, buffer); + break; default: ret = -EINVAL; break; diff --git a/include/linux/hdmi.h b/include/linux/hdmi.h index e974420..f480373 100644 --- a/include/linux/hdmi.h +++ b/include/linux/hdmi.h @@ -32,11 +32,13 @@ enum hdmi_infoframe_type { HDMI_INFOFRAME_TYPE_AVI = 0x82, HDMI_INFOFRAME_TYPE_SPD = 0x83, HDMI_INFOFRAME_TYPE_AUDIO = 0x84, + HDMI_INFOFRAME_TYPE_MPEG = 0x85, }; #define HDMI_IEEE_OUI 0x000c03 #define HDMI_INFOFRAME_HEADER_SIZE 4 #define HDMI_AVI_INFOFRAME_SIZE 13 +#define HDMI_MPEG_INFOFRAME_SIZE 10 #define HDMI_SPD_INFOFRAME_SIZE 25 #define HDMI_AUDIO_INFOFRAME_SIZE 10 @@ -297,6 +299,26 @@ int hdmi_vendor_infoframe_init(struct hdmi_vendor_infoframe *frame); ssize_t hdmi_vendor_infoframe_pack(struct hdmi_vendor_infoframe *frame, void *buffer, size_t size); +enum hdmi_mpeg_picture_type { + HDMI_MPEG_PICTURE_TYPE_UNKNOWN = 0x00, + HDMI_MPEG_PICTURE_TYPE_I = 0x01, + HDMI_MPEG_PICTURE_TYPE_B = 0x02, + HDMI_MPEG_PICTURE_TYPE_P = 0x03, +}; + +struct hdmi_mpeg_infoframe { + enum hdmi_infoframe_type type; + unsigned char version; + unsigned char length; + u32 bitrate; + enum hdmi_mpeg_picture_type picture_type; + bool repeated; +}; + +int hdmi_mpeg_infoframe_init(struct hdmi_mpeg_infoframe *frame); +ssize_t hdmi_mpeg_infoframe_pack(struct hdmi_mpeg_infoframe *frame, + void *buffer, size_t size); + union hdmi_vendor_any_infoframe { struct { enum hdmi_infoframe_type type; @@ -314,6 +336,7 @@ union hdmi_vendor_any_infoframe { * @spd: spd infoframe * @vendor: union of all vendor infoframes * @audio: audio infoframe + * @mpeg: mpeg infoframe * * This is used by the generic pack function. This works since all infoframes * have the same header which also indicates which type of infoframe should be @@ -325,6 +348,7 @@ union hdmi_infoframe { struct hdmi_spd_infoframe spd; union hdmi_vendor_any_infoframe vendor; struct hdmi_audio_infoframe audio; + struct hdmi_mpeg_infoframe mpeg; }; ssize_t

[media] hdmi: added functions for MPEG InfoFrames

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